高考英语新定语从句知识点易错题汇编及答案解析(4)
高考英语最新定语从句知识点易错题汇编附答案解析
高考英语最新定语从句知识点易错题汇编附答案解析一、选择题1．The growth of economy is influenced by a number of factors, ________are beyond our control. A．most of them B．most of that C．most of what D．most of which 2．Try to be a responsible school by not allowing anyone to attend class, ________ has had a fever.A．who B．which C．as D．that3．Take an active part in programs you enjoy______you can meet various kinds of people. A．what B．when C．that D．where4．Such a film ___________ was shown in the cinema yesterday is not suitable for children. A．as B．that C．which D．/5．Claims, if any, must be made within 30 days, _____ no claims will be accepted.A．without which B．for which C．during which D．after which 6．—How did you find your way here？—It was by following the travel brochure _____ the route is clearly clarified.A．that B．how C．where D．which7．Sales director is a position _______ communication ability is just as important as sales. A．which B．that C．when D．where8．All of us were so excited at the news ____we’ll go abroad for holidays ___we j umped with joy. A．that; that B．what; and then C．what; that D．which; so9．She brought with her three friends，none of ________ I had ever met before.A．them B．who C．whom D．these10．In China, “mythical creatures” is used to describe troublesome schoolchildren ________ behaviors drive their parents crazy.A．whose B．when C．who D．of whom 11．Allen is good at seizing every opportunity ____ he thinks he can show his best self to others. A．when B．that C．where D．which12．The reason ________ he didn’t come to school on time is ________ he had to take care of his sick brother at home.A．That; because B．that; that C．why; because D．why; that13．I am looking forward to the day ________ my daughter can read this book and know my feelings for her.A．as B．why C．when D．where14．The other two areas ________ the two varieties differ are spelling and pronunciation.A．in that B．from which C．with which D．in which15．You were very impolite to him, for _____ you should make an apology to him, I think. A．this B．which C．what D．that16．The commander got a chance to visit the mountain_____ top was covered with thicksnow ,____ he had been dreaming of for years.A．that; which B．whose ; which C．of which ; what D．of whom ;that 17．One day, my two brothers and I were coming back from the islands _______ we often riskedgoing and got more fish than othersA．which B．when C．in which D．where18．It is a truly delightful place, ________looks the same as it must have done 100 years ago with its winding streets and pretty cottages.A．as B．whereC．that D．which19．There was a time _______, if a lady got onto a crowded bus or train, a gentleman would immediately stand up and offer her his seat.A．while B．as C．when D．unless 20．Nowadays,villagers are proud of their culture and are actively protecting it,_______in turn improves the local tourism.A．that B．which C．where D．what21．Life is like a long race _______ we compete with each other to go beyond ourselves. A．where B．which C．that D．what22．It was the typhoon ________was called Tiange hit Zhuhai and Macao.A．which;that B．what;which C．that;who D．that;which23．I'm glad to introduce Mr.Smith to you,without______my experiment would have ended in failure.A．whom help me B．his help C．whose help D．who help 24．What surprised me was not what he said but the way _______ he said it.A．that B．in thatC．what D．where25．You were really between a rock and a hard place ______ you had to choose between your career and your relationship.A．when B．where C．before D．until【参考答案】***试卷处理标记，请不要删除一、选择题1．D解析：D【解析】【分析】【详解】考查定语从句。
高考英语新定语从句知识点易错题汇编及答案
高考英语新定语从句知识点易错题汇编及答案一、选择题1．The art festival is an annual event ______ the students can show off their talents.A．where B．that C．which D．as2．Take an active part in programs you enjoy______you can meet various kinds of people. A．what B．when C．that D．where3．The background music is such wonderful music _______ is played in the background to put you in a particular mood.A．what B．that C．as D．which4．John invited about 40 people to his wedding, most of are family members.A．them B．thatC．which D．whom5．He bought a new building _____top is different from those of the others around.A．what B．which C．that D．whose6．The middle and high school period is a special one for children, a transition from children to adult, ______ children tend to be rebellious (反抗的).A．when B．where C．that D．of which7．5G is an exciting mobile technology, ________ will give a massive boost to smart cities and vehicles.A．where B．when C．that D．which8．Last week, only two people came to look at the house, _______ wanted to buy it.A．neither of them B．both of them C．none of whom D．neither of whom 9．She brought with her three friends，none of ________ I had ever met before.A．them B．who C．whom D．these10．We came to a place ______ they had never paid a visit before.A．in which B．to which C．what D．which 11．Detectives are investigating the company, three of ________ senior executives have already been under arrest.A．its B．which C．those D．whose12．China Today attracts a worldwide readership, ________ shows that more and more people all over the world want to learn about China.A．who B．whomC．that D．which13．Car races are recorded and uploaded to YouTube and other video platforms, ______________ they can be viewed repeatedly.A．which B．where C．when D．there14．We won’t forget the heroes ________ l ost their lives while fighting against a forest fire. A．who B．whose C．when D．why15．By now, we have raised 50.000 pounds for the poor children, ______ is quite unexpected. A．that B．which C．who D．it16．Mr. Smith owned this oil painting until the early 1990 s, ____________he gave it to hisgrandson.A．which B．when C．where D．who17．You were very impolite to him, for _____ you should make an apology to him, I think. A．this B．which C．what D．that18．Dr. Rowan, ______ secretary resigned two weeks ago, has had to do all his own typing. A．whose B．of whom C．of which D．which19．I don't think he is the suitable person，for he____experience，____is essential for the job. A．lacks；which B．lacking；as C．lacks of；which D．lacked；that 20．Was it in the beautiful park ___was located at the foot of the mountain ___we first met our foreign teacher?A．which; where B．which; that C．which; which D．that; where 21．The course normally attracts 60 students per year, ______up to half are from Europe.A．in which B．for whom C．with which D．of whom 22．One day, my two brothers and I were coming back from the islands _______ we often risked going and got more fish than othersA．which B．when C．in which D．where23．John invited about 40 people to his wedding, most of _______are family members. A．who B．which C．whom D．what 24．English is a language shared by several diverse cultures, each of ________ uses it somewhat differently.A．which B．what C．them D．those25．You were really between a rock and a hard place ______ you had to choose between your career and your relationship.A．when B．where C．before D．until【参考答案】***试卷处理标记，请不要删除一、选择题1．A解析：A【解析】【分析】【详解】考查定语从句。
定语从句易错题及解析
定语从句易错题及解析限定性定语从句与非限定性定语从句的其别只是在于限制意义的强弱。
翻译时应十分小心，稍有不慎，就可能会出现错误。
接下来要给大家提供的是定语从句易错题及解析，欢送大家的借鉴阅读！He had thousands of students, many of gained great suess in their own field.A. whomB. themC. whichD. who【易错】容易误选 B，用 them 代指 students。
【分析】最正确答案是A，many of whom gained great suess in their own field 为非限制性定语从句。
假假设在many of…的前面加上连词and，那么选答案B。
比拟以下各题(答案均选A)：(1) He asked a lot of questions, none of was easy to answer.A. whichB. themC. whatD. that(2) He asked a lot of questions, and none of was easyto answer.A. themB. whichC. whatD. that(3) He told me that he had two girl-friends, neither of knew anything about the other.A. whomB. themC. whichD. who(4) He told me that he had two girl-friends, and neither of knew anything about the other.A. themB. whomC. whichD. whoHe had a lot of friends, only a few of invited to his wedding.A. whomB. themC. whichD. who【易错】容易误选 A，认为这是非限制性定语从句。
高考英语新定语从句知识点易错题汇编附答案
高考英语新定语从句知识点易错题汇编附答案一、选择题1．Even Amundsen was moved by Scott's death saying "Captain Scott left a record, for honesty, sincerity, for bravery, for everything _______makes a man".A．that B．which C．who D．不填2．Many nurses, ______ were retired, headed for affected areas to help.A．most of which B．most of whomC．most of them D．most of who3．Search engines search the Internet based on the key words you type in, and choose such web pages for you ________ contain the words you ask for.A．where B．who C．which D．as4．We all have times of insecurity in life, _____ there is nothing to do but bravely face the feelings of doubt.A．which B．when C．where D．that5．The middle and high school period is a special one for children, a transition from children to adult, ______ children tend to be rebellious (反抗的).A．when B．where C．that D．of which6．My brother bought a telescope, ______ he could study the star in the night sky.A．of which B．through which C．in which D．on which 7．Last week, only two people came to look at the house, _______ wanted to buy it. A．neither of them B．both of them C．none of whom D．neither of whom 8．(2014·江西)It was the middle of the night my father woke me up and told me to watch the football game.A．that B．asC．which D．when9．You were very impolite to him, for _____ you should make an apology to him, I think. A．this B．which C．what D．that10．Dr. Rowan, ______ secretary resigned two weeks ago, has had to do all his own typing. A．whose B．of whom C．of which D．which11．I don't think he is the suitable person，for he____experience，____is essential for the job. A．lacks；which B．lacking；as C．lacks of；which D．lacked；that 12．Newton is shown as a gifted scientist with every human weakness stood at the point in history magic ended and science began.A．who; where B．which; where C．who; when D．which; that 13．The commander got a chance to visit the mountain_____ top was covered with thick snow ,____ he had been dreaming of for years.A．that; which B．whose ; which C．of which ; what D．of whom ;that 14．The other two areas ________ the two varieties differ are spelling and pronunciation. A．in that B．from which C．with which D．in which 15．John invited about 40 people to his wedding, most of _______are family members. A．who B．which C．whom D．what16．It is a truly delightful place, ________looks the same as it must have done 100 years ago with its winding streets and pretty cottages.A．as B．whereC．that D．which17．Nowadays,villagers are proud of their culture and are actively protecting it,_______in turn improves the local tourism.A．that B．which C．where D．what18．During the holiday I bought a CD player, _____ was rather reasonable.A．its price B．of which priceC．the prices of which D．whose price19．We’re listed some of the most famous flowers have a special significance.A．what B．that C．where D．/20．The students enjoyed this new game, _________ was named after the school.A．where B．whose C．which D．who21．Life is like a long race _______ we compete with each other to go beyond ourselves. A．where B．which C．that D．what22．This is the last factory ________ he used to work at, many workers of _______ still have a good relationship with him.A．/; it B．which; whom C．/; which D．which; that23．_______ is known to all, grammar is not a set of dead rules.A．That B．Which C．As D．It24．What surprised me was not what he said but the way _______ he said it.A．that B．in thatC．what D．where25．Giving credit where credit is due is a good habit to form, ____________ rewards are immeasurable.A．which B．where C．whose D．its【参考答案】***试卷处理标记，请不要删除一、选择题1．A解析：A【解析】【分析】【详解】考查定语从句。
高考英语定语从句知识点易错题汇编及解析(4)
高考英语定语从句知识点易错题汇编及解析(4)一、选择题1．Giving credit where credit is due is a good habit to form, ____________ rewards are immeasurable.A．which B．where C．whose D．its2．I’ve come to the point____I can’t stand her arguing any longer.A．why B．which C．that D．where3．Such a film ___________ was shown in the cinema yesterday is not suitable for children. A．as B．that C．which D．/4．The book tells stories of the earthquake through the eyes of those lives were affected A．whose B．thatC．who D．which5．In the darkness we felt our way forward, trying to cross the stream _______ it was shallowest. A．in which B．that C．as D．where6．The background music is such wonderful music _______ is played in the background to put you in a particular mood.A．what B．that C．as D．which7．The middle and high school period is a special one for children, a transition from children to adult, ______ children tend to be rebellious (反抗的).A．when B．where C．that D．of which 8．Liberty, equality, and fraternity are the ideals _______ human beings have been fighting. A．to which B．against which C．with which D．for which9．All of us were so excited at the news ____we’ll go abroad for holidays ___we jumped with joy. A．that; that B．what; and then C．what; that D．which; so10．In China, “mythical creatures” is used to describe troublesome schoolchildren ________ behaviors drive their parents crazy.A．whose B．when C．who D．of whom11．The Molalla High School has a wall of Post-it notes ________ students write kind messages for kids to take when they have a bad day.A．that B．which C．when D．where12．The reason ________ he didn’t come to school on time is ________ he had to take care of his sick brother at home.A．That; because B．that; that C．why; because D．why; that 13．Mr. Smith owned this oil painting until the early 1990 s, ____________he gave it to his grandson.A．which B．when C．where D．who14．A good advertisement often uses words ________people attach positive meanings.A．that B．which C．with which D．to which15．The commander got a chance to visit the mountain_____ top was covered with thicksnow ,____ he had been dreaming of for years.A．that; which B．whose ; which C．of which ; what D．of whom ;that16．I shall never forget those years _______ I spent on the farm with the farmers, _______ has a great effect on my life.A．when; who B．that; which C．which; that D．when; which 17．The course normally attracts 60 students per year, ______up to half are from Europe.A．in which B．for whom C．with which D．of whom 18．Even Amundsen was moved by Scott's death saying "Captain Scott left a record, for honesty, sincerity, for bravery, for everything _______makes a man".A．that B．which C．who D．不填19．This restaurant has an inviting, homelike atmosphere ______ many others are short of. A．where B．when C．which D．what20．During the holiday I bought a CD player, _____ was rather reasonable.A．its price B．of which priceC．the prices of which D．whose price21．We have entered into an age _______ dreams have the best chance of coming true. A．which B．what C．when D．that 22．Eventually, the butterfly manages to reach the place____________ it will spend the winter. A．which B．when C．that D．where23．The tower, _________ was destroyed in the terrible storm, has been repaired.A．the roof B．which roof C．its roof D．the roof of which 24．Life is like a long race _______ we compete with each other to go beyond ourselves. A．where B．which C．that D．what25．Car races are recorded and uploaded to YouTube and other video platforms, ______________ they can be viewed repeatedly.A．which B．where C．when D．there【参考答案】***试卷处理标记，请不要删除一、选择题1．C解析：C【解析】【分析】【详解】考查定语从句。
高考英语考试易错题定语从句解析版
专题10 定语从句备战2023高考英语考试易错题（新高考专用）（解析版）一易错题类型【易错题01】语法填空中关系词的误用1.【2022新高考I卷】The GPNP is intended to provide stronger protection for all the species ___45___ live within the Giant Panda Range and significantly improve the health of the ecosystem in the area.【答案】that【错误分析】长难句中无法判断定语从句，导致误用别的各类连词；that与which的区别不清。
【解题思路】考查定语从句关系词。
句意：该计划旨在为生活在Giant Panda Range的所有物种提供更有力的保护，并显著改善该地区的生态系统健康。
设空处为关系词引导限制性定语从句，设空处在从句中作指物的主语，先行词为species，且先行词前为all修饰，只能用关系代词that。
故填that。
2.【2022全国甲卷】On the 1,100. Kilometer journey, the man Cao Shengkang, ___62___ lost his eyesight at the age of eight in a car accident, crossed 40 cities and counties in three province.【答案】who【错误分析】不看意思，只凭借空格前有逗号，逗号后用which的错误经验主义。
【解题思路】考查非限制性定语从句。
在1100公里的旅程中，8岁时因一次车祸失明的男子曹盛康穿过了三个省的40个城市和县。
此处是非限定性定语从句，先行词为Cao Shengkang，指人，在从句中作主语。
故填who。
3.【2021新课标II卷】I decided that if I learned of a company___________ used a lot of plastic, I'd send it an email urging it to cut back.【答案】that/which【错误分析】只看先行词表地点，而没有注重关系词在从句中的句子成分。
高考英语新情景交际及习惯表达知识点易错题汇编含答案解析(4)
高考英语新情景交际及习惯表达知识点易错题汇编含答案解析(4)一、选择题1．—There is a belief that the robots will take the place of human beings one day.—After all, they don't have their own thinking.A．Don't mention it.B．It depends.C．I don't think so.D．I have no idea.2．- May I help you? You seem to be having some problems.- _________, thanks. I think I can manage.A．All right B．No problem C．It’s all right D．No way 3．—Mrs.Smith， please teach me how to draw on the computer today.—Oh，no. . You have to get familiar with the keyboard first.A．Think twice before you doB．Learn to walk before you runC．All things are difficult before they are easyD．Don't county our chickens before they are hatched4．—Could I use your computer for a few moments，please?—________.I'm not using it myself.A．Come on B．It dependsC．Go ahead D．That's great5．—Sid is never happy when he has nothing to do.―I know. ______.A．He has good taste B．He has done very wellC．It really bothers him D．It's none of his business6．-I really had a wonderful time at the party last night.-______.A．Oh, that’s very nice of you B．CongratulationsC．It’s a pleasure D．Oh, I’m glad to hear that7．-I think you'd better clean your room.-_________It's clean enough.A．What for?B．So what?C．You said it.D．You made it. 8．—Going t o watch the Women’s V olleyball Match on Wednesday?—________! Will you go with me?A．You there B．You betC．You got me D．You know better9．—Kobe Bryant was a basketball star with strong fighting spirit.—_____________. He's always a role model for youngsters.A．I couldn't agree more.B．I can't help it.C．I couldn't be bothered.D．I beg to differ.10．—Why didn’t you pay the accommodation rent?—The rent? That isn’t ________ till Sunday.A．sure B．okayC．due D．late11．—It is reported that the Shanghai auto show stops using models. How about yours?—We will_______.A．follow suitB．sink or swim togetherC．set eyes on itD．get to the bottom of it12．— We got through the most difficult times with their help.— . Those days are gone.A．You said it B．Keep it up C．That’s terrible D．Take your time 13．—Linda, would you like to come and taste the dishes I have cooked?—Don’t ______. You even don’t know how to fry an egg.A．rain cats and dogs B．pull my leg C．be all ears D．be all thumbs 14．—It’s reported that huma n got the first picture of a black hole on April 10, 2019.— ________A．Good news.B．All right.C．So what?D．How come? 15．—We are going to have a picnic this afternoon. Are you excited?—________．A．You know B．You bet C．You name it D．You mean it 16．—I’ve been promoted to the director of HR and I’m wondering whether I can ask for a big pay rise .—________. After all, the economy is struggling these days.A．You can make it.B．Good for you C．You’ve gone too far D．It’s up to you 17．—I lost five pounds just after a week on this new diet. It's definitely worth a try.—Right, _____. I definitely need to get in shape for my school reunion.A．You have my words B．I don’t buy it C．You’ve sold it to me D．I just can’t help it 18．—I feel terrible. I didn't do well in the physics test.—____________. You have already made progress and will surely learn it well.A．That' s right.B．It is impossible.C．That sounds crazy.D．Don' t take it too hard.19．—It’s very kind of you to give me a lift back home.—____________. I'm just driving your way.A．With pleasure B．It doesn't matter.C．That's right.D．Think nothing of it. 20．—We shouldn’t waste time on playing computers games or reading novels.—______. We’d better concentrate our attention to our study instead.A．I’d love to B．I’m with you on thatC．It’s up to you D．It’s my pleasure21．—The deadline is approaching and time is running out.—_______,or we won't complete the project in time.A．Come off it B．Take your timeC．Step on it D．Start from scratch22．—A second，please.I have another call coming through.—________.I’m not in a hurry.A．Enjoy yourself B．Leave me aloneC．Do as you like D．Take your time23．—Betty was feeling pretty blue for a while, but she’s better now.— _________.A．Congratulations B．It’s my pleasureC．Oh, tha t’s kind of you D．Oh, I’m glad to hear that24．—Let’s go for a picnic this weekend together with our classmates, OK?—_______. I love getting close to nature.A．I couldn’t agree more B．That’s all rightC．Out of the question D．I’m afraid not25．--Reading is the best way to pass time on the train.-- , I never go traveling without a book.A．You are joking B．That's trueC．I don't think so D．It sounds like fun【参考答案】***试卷处理标记，请不要删除一、选择题1．C解析：C【解析】【分析】【详解】考查情景交际。
高考英语易错题汇编(附答案解析)
高考英语易错题汇编（思维定势）1. They ______ on the program for almost one week before I joined them, and now we _____on it as no good results have come out so far.A. had been working; are still workingB. had worked; were still workingC. have been working; have workedD. have worked; are still working此题的时间参照点是before I joined them,，所以第一个空应该用过去完成进行时，第二个空根据时间now用现在进行时。
2. It would be a good idea to use a plastic bottle, ___cut off, as a container to grow young plants in.A. of which the topB. the top isC. the top of whichD. with its top此题是独立主格结构，如果题干改为 ____is cut off,答案则为A或C3. ______ is it _____ has made Peter _____ he is todayA. What; that; thatB. That; that; whatC. What; what; thatD. What; that; what用还原法则为 It is what that has made Peter what he is today k可知是强调句式。
4. Before he went abroad，he spent as much time as he _____ English.A. could learningB. learnedC. to learnD. could learnspend time (in) doing sth 如果改为he did what he ______, 则答案为could to learn.5. The person we talked about ____ our school last week．A．visiting B．will visit C．visited D．has visited此题中包含一个定语从句，the person既作先行词，又作句子的主语，要填入的应该是句子的谓语，根据后面的时间状语为last week，应选过去时。
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高考英语新定语从句知识点易错题汇编及答案解析(4)一、选择题1．Occasions are quite rare ____ I have the time to spend a day with my kids.A．who B．which C．why D．when 2．Among the many dangers__________ sailors have to face, probably the greatest of all is fog. A．which B．whatC．where D．when3．Optimism is the essential ingredient of top performers,__________we assume separates the high achievers from the rest.A．as B．who C．which D．that4．In the darkness we felt our way forward, trying to cross the stream _______ it was shallowest. A．in which B．that C．as D．where5．The background music is such wonderful music _______ is played in the background to put you in a particular mood.A．what B．that C．as D．which6．The president of Harvard pioneered the elective system______ students were able to choose their own courses of study.A．on which B．about which C．to which D．by which7．The middle and high school period is a special one for children, a transition from children to adult, ______ children tend to be rebellious (反抗的).A．when B．where C．that D．of which 8．—How did you find your way here？—It was by following the travel brochure _____ the route is clearly clarified.A．that B．how C．where D．which9．We came to a place ______ they had never paid a visit before.A．in which B．to which C．what D．which10．Allen is good at seizing every opportunity ____ he thinks he can show his best self to others. A．when B．that C．where D．which11．I saw a man shouting at a driver, ________ the car is blocking the street.A．whose B．of whom C．of which D．whom 12．Many nurses, ______ were retired, headed for affected areas to help.A．most of which B．most of whomC．most of them D．most of who13．Mr. Smith owned this oil painting until the early 1990 s, ____________he gave it to his grandson.A．which B．when C．where D．who14．The other two areas ________ the two varieties differ are spelling and pronunciation.A．in that B．from which C．with which D．in which 15．The book has helped me greatly in my daily communication, especially at work ________ a good impression is a must.A．which B．when C．as D．where16．The commander got a chance to visit the mountain_____ top was covered with thicksnow ,____ he had been dreaming of for years.A．that; which B．whose ; which C．of which ; what D．of whom ;that 17．Was it in the beautiful park ___was located at the foot of the mountain ___we first met our foreign teacher?A．which; where B．which; that C．which; which D．that; where 18．The course normally attracts 60 students per year, ______up to half are from Europe.A．in which B．for whom C．with which D．of whom 19．This restaurant has an inviting, homelike atmosphere ______ many others are short of. A．where B．when C．which D．what 20．Nowadays,villagers are proud of their culture and are actively protecting it,_______in turn improves the local tourism.A．that B．which C．where D．what 21．During the holiday I bought a CD player, _____ was rather reasonable.A．its price B．of which priceC．the prices of which D．whose price22．English is a language shared by several diverse cultures, each of ________ uses it somewhat differently.A．which B．what C．them D．those23．A good advertisement often uses words ________people attach positive meanings.A．that B．which C．with which D．to which24．It was the typhoon ________was called Tiange hit Zhuhai and Macao.A．which;that B．what;which C．that;who D．that;which25．I am looking forward to the day ________ my daughter can read this book and know my feelings for her.A．as B．why C．when D．where【参考答案】***试卷处理标记，请不要删除一、选择题1．D解析：D【解析】答案：D。
考查定语从句。
句意：我难得有时间和孩子们一起过一天。
先行词为occasions，表时间。
2．A解析：A【解析】【分析】考查定语从句。
句意：在水手不得不面对的许多危险中，可能最大的是雾霾。
由句子意思可分析出，sailors have to face作定语，修饰先行词the many dangers，且从句缺少宾语（face...），要用关系代词。
因此A选项正确。
【点睛】本题考查定语从句中which的用法，which所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等也就是说做题时要注意句子中是否缺少主语。
宾语等成分，然后判断关系代词，学生要注意分析定语从句在不同情况下的应用，才能面对更多的题型。
3．C解析：C【解析】【分析】【详解】考查非限制性定语从句。
句意：乐观是优秀表现者的基本要素，我们认为这是成功人士与其他人的区别。
分析句子结构可知，此处引导非限制性定语从句，修饰先行词the essential ingredient，且先行词在从句中作主语，指代the essential ingredient应用关系代词which，we assume为插入语。
A选项中as引导非限制性定语从句时，有“正如”之意；B选项who在从句中指代人，不符合；D选项that不能引导非限制性定语从句。
故选C。
4．D解析：D【解析】【分析】【详解】考查定语从句。
句意：在黑暗中，我们摸索着前进，试图从小溪最浅的地方穿过小溪。
本句为定语从句修饰先行词stream，且先行词在从句中做地点状语，故用关系副词where。
A 选项in which，从句中动词无法与in连用，故不能选A；B选项that在从句中作主语或宾语，不符合；C选项as引导非限制性定语从句，本句为限制性定语从句，与题干不符。
故选D。
5．C解析：C【解析】【分析】【详解】考查定语从句。
句意：背景音乐就是这样美妙的音乐，是在背景中播放，让你有一种特别的心情。
当先行词被such/as/so/the same修饰时，从句中缺少主语、宾语和表语时，定于从句需用as引导。
本句先行词wonderful music前有such修饰，故用as引导定语从句。
故选C。
6．D解析：D【分析】【详解】考查定语从句。
句意：哈佛大学的校长率先推出了选修课，学生可以选择自己的课程。