英语连词练习题含答案
英语连词连接词试题答案及解析
英语连词连接词试题答案及解析1. ________he visited, he wasted no time hearing farmers' voices at home and in the fields. A．Each time B．In case C．Even if D．In time【答案】A【解析】句意：每次他下乡，他都抓紧时间听听家里和田间农民的心声。
这里each time意为：每次。
名词用作连词，引导时间状语从句。
所以选A。
【考点】考查状语从句的连接词。
2.— Have you told Mary the good news that she was admitted into Shandong University?— Yes. I told her ________I saw her this morning.A．while B．the moment C．until D．suddenly【答案】B【解析】句意：今天早上我一看到她，我就告诉了她。
此处the moment名词用作连词，意为：一……就……。
所以B正确。
【考点】考查状语从句的连接词。
3. (2013·全国Ⅰ，32)There's no way of knowing why one man makes an important discovery________ another man, also intelligent, fails.A．since B．ifC．as D．while【答案】D【解析】本题考查连词的用法。
句意：没有办法知道为什么一个人取得重大发现，而另一个人，也很聪明，却不能。
while 而，却，引导并列句，符合题意。
4.（2013·大纲卷）I was glad to meet Jenny again, I didn't want to spend all day with her. A．but B．and C．so D．or【答案】A【解析】考查并列连词。
连词练习题(附答案)
连词练习题(附答案)一、从属连词1．He was so busy. He cannot afford enough time with his son ________ he really wants to. A．as if B．even if C．in case D．before long2．I like the city, but I like the country better I have more friends there.A．in which B．for which C．in that D．at that3．You will never achieve success _______ you keep working hard.A．when B．if C．unless D．because4．He hasn’t got any hobbies—________ you call watching TV a hobby.A．if B．as long as C．unless D．although5．________ things had been tough at times when he was in school, he graduated from college with the highest honor.A．If B．While C．Because D．As6．We’ve been friends________we came to this school a year ago.A．when B．for C．before D．since7．--- Will you go to the history museum tomorrow?--- Sure I will, ________ it doesn’t rain heavily.A．in case B．as if C．as long as D．even if8．________ he is determined to do something, no one is able to persuade him to________. A．If; give away B．Although; give in C．As long as; give out D．Once; give up 9．The little girl won’t go to sleep at noon _______ her mother tells her a story.A．or B．but C．if D．unless 10．Don’t stop ________ you meet with a word you don’t understand.A．at that time B．each time C．sometimes D．before11．______ the man isn’t very rich, he gives a large amount of money to the students every year. A．Though B．Since C．Unless D．If12．______ you have set your mind on the goal, you must try your best to achieve it. A．Though B．Unless C．Once D．While13．She remembered it________ it were yesterday and knew it would haunt her forever.A．as though B．even though C．as soon as D．the moment 14．The writer always carries a notebook along with him, ________ he is seized by sudden inspiration.A．in case B．even though C．now that D．the moment 15．It’s mor e than half a century ________ my grandfather joined the Party and became a servant to the people.A．when B．that C．since D．as 16．Travelers will be unable to go to the city________ they have a booking in a restaurant or hotel.A．if B．because C．while D．unless17．_________ you try to do something beyond what you have already mastered, you will never grow.A．Once B．If C．Because D．Unless18．The two girls kept talking in the room ________ their mothers said goodbye to each other. A．when B．unless C．while D．until19．______ the fire broke out, all the students were sleeping soundly.A．Because B．In case C．When D．As long as 20．They were staring at me _______ I were some kind of an alien（外星人）.A．even if B．if only C．only if D．as if二、并列连词21．______, the students in Shiyan High School do about 3000 meters every day, ______ their parents may do far more than that.A．In theory; but B．On average; whileC．In particular; when D．In response; where22．- All the salt is sold out!- People are crazy! experts say there is no use eating salt to prevent radiation(辐射), some people still don’t believe it.A．Unless B．AlthoughC．As a result D．In order that23．It looked like rain. , it is clear this morning.A．While B．ButC．However D．So24．Be careful ______ you’ll make fewer mistakes.A．or B．asC．and D．but25．He missed the worst of the traffic this morning, ______ he set out before 6 o’clock. A．but B．soC．for D．or26．【2018·海淀二模】—Excuse me, sir. Can you spare me a dollar ________ I can buy this book?—Sure, no problem.A．for B．soC．but D．or27．I had just got up and was about to cook my breakfast______ the telephone rang loudly, but it hung up ______ I could answer it.A．while; when B．when; asC．as; after D．when; before28．I hope you don’t mind me asking, ________ where did you b uy those shoes?A．so B．and C．yet D．but29．The artist was born poor, poor he remained all his life.A．and B．or C．but D．so30．Give me your email address，____________ I’11 send you the form·A．or B．and C．but D．nor31．Tom is really good at science, his brother is a natural artist.A．while B．becauseC．for D．as32．There’s no way of knowing why one man makes an important discovery __________ another man, also intelligent, fails.A．while B．when C．where D．why33．—How does your mother like your presents f or Mother’s Day?—Well, this sweater that one is fit for her. They’re too big.A．both; and B．either; orC．neither; nor D．not only; but also34．—I hear Susan will go to Beijing by herself.—That’s true her father her mother will go with her.A．both, and B．either, or C．neither, nor35．I thought we’d be late for the concert, ______ we ended up getting there ahead of time. A．but B．or C．so D．for36．Notices in the waiting room requested that you can neither smoke ________ shout loudly. A．and B．or C．so D．nor37．Tom is a quiet student in class, _______________ he is quite active in outdoor activities. A．so B．and C．because D．but38．Which one of the following sentences is the compound sentence(并列句)?A．Playing football and dancing are his favourites.B．The good news is that this stormy period will not last.C．You feel ready to be more responsible and make decisions on your own.D．I don’t know what “home” is, but unhappiness and worries melt away once there. 39．Walk along this road for 100 meters ________ you’ll see the hospital.A．or B．otherwise C．and D．or else 40．Some people like dogs______ others like cats.A．while B．besidesC．and so D．when【参考答案】一、从属连词【解析】【详解】考查连词词义辨析。
(英语)英语连词练习题20篇含解析
（英语）英语连词练习题20篇含解析一、初中英语连词1．British people say "please" and "thank you" all the time some people in Asia may think it unnecessary.A. whileB. becauseC. unlessD. since【答案】 A【解析】【分析】句意：英国人总是说“请”和“谢谢”，而亚洲的一些人可能认为这是不必要的。
A 然而，当……的时候；B 因为；C 除非，如果不；D 自从。
根据语境，可知前后句是转折关系，故选A。
【点评】考查连词辨析。
注意识记各连词的含义及用法。
2．This is the most important task should be finished soon.A. whichB. whatC. thatD. /【答案】 C3．—Tom, what does "Stay hungry, stay foolish." mean?—You can have your own understanding. But I think it means follow your original aspiration （初心） you will succeed.A. soB. butC. andD. or【答案】 C4．—My parents are crazy about Running Man. How about your parents?—_________ my dad _________ my mum likes it. Instead, they prefer The Voice of China.A. Neither; norB. Both; andC. Not only; but also【答案】 A5．My wallet dropped on the ground ________________ I was walking.A. beforeB. afterC. whileD. because【答案】 C6．The film is really exciting. ______the students ______ their teacher is enjoying the film.A. Both; andB. Not only; but alsoC. Either; orD. Neither; nor【答案】 B7．___________three fourths of the Earth's surface is covered with water, 97 percent of it is salt water in the sea.A. ButB. AlthoughC. AsD. However【答案】 B8．Your dream will come true ______________ you put your heart and soul into it.A. ifB. unlessC. althoughD. until【答案】 A【解析】【分析】句意：如果你全心全意，那么你的梦想将会实现。
【英语】连词练习题(含答案)
【英语】连词练习题（含答案）一、初中英语连词1.Although she is under great stress,she always wears a smile on her face.A. andB. orC. butD. /【答案】D2.Tom won't play computer games he finishes his homework.A. ifB. so thatC. unlessD. although【答案】C3.— I'm wondering she is willing to do it.—Don't worry. I don't doubt she can do it well.A. if; thatB. that; ifC. if; ifD. that; that【答案】A【解析】【分析】句意：一一我想知道她是否愿意做这件事。
一一别担心。
我很相信她能做好这件事。
根据wonder可知，宾语从句的连词是if,是否，doubt的否定形式引导的宾语从句连词是that，其后不缺少成分且语意完整，故选A。
【点评】考查连词，注意宾语从句的用法。
4.—will the meeting last?—we reach an agreement.A. How long; Not untilB. When; Not untilC. How long; UntilD. When; Till【答案】C【解析】【分析】句意：一一会议会持续多久？一一直到我们达成协议。
last是持续动词，提问持续动词所持续的时间用how long,故排除B和D选项，until表示动作的持续，故选C。
【点评】考查连词，注意how long和until的用法。
5.Could you tell me the singer will come to our school or not?A. ifB. whetherC. thatD. what【答案】B【解析】【分析】句意：你能告诉我歌手是否会来我们学校吗？whether...or not,固定搭配，是否，故选B。
连词练习(含答案)
A．asB．that
C．whichD．where
【答案】A
【解析】
试题分析：考查惯用法及连接词。as it is是惯用词，意思是：像现在这样，事实上,实际上。句意：如果你要过上快乐的生活，你最好要学会接受生活本来的样子（即生活的真实面目）。
考点：考查惯用法及连接词。
17．Stephen Hawking believes that the earth is unlikely to be the only planetlife has developed gradually.
A．which B．what C．them D．those
【答案】A
【解析】考查定语从句。句意：英语是几种不同文化共同使用的语言，每种不同的文化都会不同的使用它。根据与前面句子之间是逗号，没有连词，故判断后一句是定语从句；这里用which代指several diverse cultures，引导非限制性定语从句。故选A。
A．unless B．while
C．once D．if
【答案】A
【解析】
【详解】
考查从属连词辨析。句意：我们所有的设备都可以追溯到20世纪60年代和70年代；除非我们能买到必要的技术，否则我们不能生产与外国产品相竞争的产品。A. unless除非；B. while当…时候；C. once一旦；D. if如果。分析句子可知，本句为条件状语从句，所以应用表示条件的从属连词，故unless符合句意。故A选项正确。
英语连词题20套(带答案)
英语连词题20套(带答案)一、初中英语连词1．Mr. Smith is very rich, ________ he doesn't feel happy.A. andB. orC. butD. so【答案】 C【解析】【分析】句意：史密斯先生非常有钱，但是他感觉不开心。
very rich非常有钱和后面的doesn't feel happy，感觉不开心是转折关系，but但是，表转折，故选C。
【点评】考查连词，根据句意来选择合适的连词。
2．My mother has little interest in football ___________ she didn't watch the live match on TV yesterday evening.A. soB. ifC. thoughD. when【答案】 A3．Giveme your email address, _______I'll send you the form.A. orB. andC. butD. nor【答案】 B4．They waited ____ it was dark before leaving, ____ they didn't want anyone to see them leave.A. since; becauseB. until; asC. unless; butD. so; because【答案】 B5．How can we improve our environment a lot each of us does something useful for it? A. while B. until C. after D. unless【答案】 D6．Although she is under great stress, ______ she always wears a smile on her face.A. andB. orC. butD. /【答案】 D7．I got up at six this morning _____________ I could catch the early bus to Nanjing.A. soB. thatC. in order toD. so that【答案】 D8．_____________ my brother arrived in Thailand, he visited the local biggest temple at once. A. As soon as B. While C. Until D. Before【答案】 A9．Peter bought some goldfish ______________ he found it difficult to raise them.A. becauseB. orC. thoughD. until【答案】 C10．__________ the teacher came in, the students stopped reading at once.A. WhenB. WhileC. BeforeD. /【答案】 A11．You'd better travel around Nanjing with a local tour guide ______________ you want to know more about its culture.A. unlessB. untilC. althoughD. if【答案】 D【解析】【分析】句意：如果你想了解南京的文化，最好带着当地的导游游览一下。
连词练习题(附答案)经典
连词练习题(附答案)经典一、从属连词1．—How do you like the concert given by the “Foxy Ladies”?—Exciting, ________ one piece of the music wasn’t played quite well.A．so B．though C．because D．and2．______ I saw my father ,I burst into tears.A．The instant B．both A and D C．At the instant D．Instantly3．_____, there seemed little hope that the adventurer would find his way through the vast rainforest.A．Confused by the mapB．As he had been confused by the mapC．Having been confused by the mapD．He had been confused by the map4．hings had been tough when he was in school, he graduated from college with the highest honor.A．If B．While C．Because D．As5．________ he passed away in 1961, Mei Lanfang had been performing and encouraging the spread of Peking Opera for almost 60 years.A．Once B．As C．Until D．Since6．He made a serious mistake. But he took action to change that ________ it got worse. A．until B．unless C．when D．before7．_________ advice I give him, he always behaves in his own way. I simply can’t do anything with him.A．How B．Whatever C．However D．No matter8．How long will it take________ your father recovers from his illness?A．since B．after C．before D．when9．Take a taxi, you'll miss your train.A．and B．if C．otherwise D．but10．I’ve been fond of hiphop music ________ H iphop Man was shown on TV.A．while B．since C．unless D．until11．The dictionary is so expensive ______ I can’t buy it.A．because B．when C．that D．if12．We will visit the Olympic Village ________ it rains tomorrow.A．unless B．as soon as C．when D．since13．How the loans are paid should be of little concern to the bank ________ they are paid on time. A．as far as B．as soon as C．as long as D．as well as14．-Shall we go out for a walk?-I'm afraid not. We can't go out________our work is being done.A．before B．until C．as ` D．after15．The shepherd and his dog set out early in the morning ________they could drive the flock of sheep to the valley before the noon.A．because B．before C．so that D．while16．The contradiction between unbalanced and inad equate development and the people’s ever-growing needs for a better life is ________ we must face up to.A．that B．what C．how D．where17．_______ he was new to the work, he was doing it very well.A．For B．As C．Though D．Despite 18．Since I have little work experience, I will have to take a series of unpaid internships________ I can find my ideal job.A．before B．after C．once D．when19．---Have you heard that Tom Smith was fired?--- It’s not surprising at all, that’s________ he never finishes any work the bos s arranged . A．why B．that C．because D．for20．Don’t stop ________ you meet with a word you don’t understand.A．at that time B．each time C．sometimes D．before二、并列连词21．—Can I try the shirt on, mom?—Well, it really looks nice, ____________ I think you look good in it.A．but B．and C．for D．or22．--Did you give him the book?--Yes,I gave it to him ____I saw him.A．subtly B．convincinglyC．optimistically D．directly23．He was on the point of telling me the secret ___________someone patted him on the shoulder.A．as B．whenC．while D．then24．It’s said that Chinese people are living for others, ___________ the Americans are for themselves.A．while B．becauseC．as D．since25．The woman often complain that she does every single bit of housework ________ her husband Bob just does the dishes now and then.A．while B．since C．when D．as26．Give me your email address，____________ I’11 send you the form·A．or B．and C．but D．nor27．His children ______ his wife ______ invited to the party.A．and, was B．as well, were C．as well as, was D．as well as, were 28．__________these messages always seem important at the time, most people can’t reallyremember them the next day.A．Because B．Unless C．While D．Since29．He missed the worst of the traffic this morning, ______ he set out before 6 o’cloc k.A．but B．soC．for D．or30．(2017·北京卷·单项填空)—Peter, please send us postcards ________ we'll know where you have visited.—No problem.A．but B．orC．for D．so31．Although the Roma couldn’t be forced to pay taxes, they couldn’t vote ______they agreed to ______a government.A．unless, submit to B．until, correspond toC．when, resign to D．while, compromise to32．Zhao Wei is ________ a popular singer, ________ a beautiful actress.A．not only, but also B．between, and C．as, as D．not only, as well 33．The young man tried to stop, ________he drove too fast to stop.A．and B．but C．so D．or34．The shepherd and his dog set out early in the morning ________they could drive the flock of sheep to the valley before the noon.A．because B．before C．so that D．while35．Either Bill or you ________ on duty yesterday morning.A．is B．are C．was D．were36．When we design a building, we should provide an entrance suitable for wheelchair on the passage, ________ lifts, suitable bathrooms and toilets.A．except B．as well C．as well as D．but37．Befor e getting into the car, I thought I had learned the instructor’s orders, ________ once I started the car, my mind went blank.A．so B．and C．for D．yet38．— Someone wants you on the phone.— ________ nobody knows I am here.A．Although B．AndC．So D．But39．The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.A．what B．whichC．that D．though40．Schools in the north tend to be better equipped, _______those in the south are relatively poor.A．as B．since C．while D．because【参考答案】一、从属连词1．B【解析】【详解】考查连词词义辨析。
连词练习题(附答案)经典
连词练习题(附答案)经典一、从属连词1．--Did your brother come back early last night?--Yes. It was not yet eight o’clock ________ he arrived homeA．when B．before C．that D．until2．How time flies! I feel junior high school was only yesterday!A．even if B．unless C．if D．as if3．They are thinking of buying the house _______the prices go up.A．when B．after C．as D．before4．If you go exploring, you should prepare a good map, a compass, a raincoat, a cellphone to call for help____you get lost, and a bit of spare cash for emergencies.A．even if B．in case C．as long as D．as if5．I don’t believe we’ve met before, ________I must say you do look familiar.A．given that B．although C．since D．unless6．The police offices in our community work hard ______ the rest of us can live a safe life. A．on condition that B．so as toC．in order that D．for fear that7．Mr. Black walked around and offered help________ we were doing an experiment. A．while B．although C．until D．unless 8．Fortunately, someone called the fire department ________ the fire broke out.A．instantly B．the instantly C．instant D．an instant9．I am concerned, the strengths mentioned above exceed the weaknesses.A．As long as B．As far as C．As well as D．So long as10．________ the learning is slow and painful, the result is wonderful.A．As B．Unless C．Even though D．Since11．I hurried______I wouldn’t be late for class.A．so B．so that C．if D．unless12．________you want me to fire you, I suggest you stop wearing sports clothes at office.A．If B．Since C．Unless D．Until13．--- What would you do if it rains tomorrow?--- We have to carry it on, ________ we’ve got everything ready.A．since B．though C．in case D．unless14．---Have you heard that Tom Smith was fired?--- It’s not surprising at all, that’s________ he never finishes any work the boss arr anged . A．why B．that C．because D．for15．______I am at home, my mother keeps pressing me to study all the time.A．Because B．When C．Though D．Until16．The two girls kept talking in the room ________ their mothers said goodbye to each other. A．when B．unless C．while D．until17．______ the man isn’t very rich, he gives a large amount of money to the students every year. A．Though B．Since C．Unless D．If18．I won’t believe you______ I have seen it with my own eyes.A．while B．until C．after D．when19．______ you study ha rder, you’ll never pass the final exam.A．If B．Until C．Unless D．Except 20．When a new movement in art contributes to a certain fashion, it is advisable to find out what its advocates are aiming at, for ________ unreasonable their principles may seem today, it is possible that in years to come they may be regarded as normal.A．what B．however C．though D．which二、并列连词21．—Why can't you get used to the life in Beijing?—________ the crowed traffic ________ the high living cost. The only reason is the badly polluted air.A．Not only; but also B．Either; or C．Both; and D．Neither; nor22．I think Tom will make a good monitor, ________ I’d like to vote for him.A．but B．forC．or D．so23．It’s said that Chinese people are living for others, ___________ the Americans are for themselves.A．while B．becauseC．as D．since24．Detective Sam Peterson told the journalists ________ they hadn’t dismissed the idea that Justin was taken away by the aliens, they were looking into other possibilities.A．when B．whileC．unless D．until25．Jenny feels a blankness ________ she once felt a sense of purpose and excitement. A．unless B．where C．as D．since26．“Put on your coat, ______ you will catch a cold!” This is what my mum often says . A．and B．but C．or D．so27．The sun is bigger than the moon , ___ we all know it.A．and B．as C．which D．it28．Ten minutes earlier, _____we could have saved the boy.A．or B．otherwise C．and D．so29．It’s seemingly unfair that girls can change into skirts during the hot weather ___________ boys have to swelter in long trousers.A．since B．whileC．when D．as30．Are you here for the activity of making, buying or selling things for money ________ pleasure?A．and B．or C．but D．for31．We thought there were 35 students in the lecture hall, ___________, in fact, there were 40. A．while B．whetherC．what D．which32．Since these two countries are quite different in the social systems, it is ________ necessary ________ possible for the two sides to change each other.A．either; or B．both; and C．not; but D．neither; nor 33．You must learn to consult your feelings and your reasons ________ you reach any decision. A．although B．before C．because D．unless 34．Before getting into the car, I thought I had learned the instructor’s orders, ________ once I started the car, my mind went blank.A．so B．and C．for D．yet35．I thought he was listening to my opinions, _____ in fact he was thinking about his own affairs.A．when B．while C．so D．however36．If you let challenges and difficulties benefit ______ depress you, much more can be accomplished than you thought possible.A．more than B．rather than C．less than D．other than 37．Nobody can go back and start a new beginning, ______ anyone can start now and make a new ending.A．for B．andC．but D．so38．—Take a taxi, you won't get the airport in time.—OK, I will. See you!A．instead B．thusC．otherwise D．meanwhile39．A person’s quality may usually be known by his behavior ________ by the friends he keeps. A．as well as B．as ifC．as soon as D．as usual40．—I hear Susan will go to Beijing by herself.—That’s true her father her mother will go with her.A．both, and B．either, or C．neither, nor【参考答案】一、从属连词1．A【解析】【详解】考查连词。
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英语连词练习题含答案一、初中英语连词1．Could you tell me __________the singer will come to our school or not?A. ifB. whetherC. thatD. what【答案】 B【解析】【分析】句意：你能告诉我歌手是否会来我们学校吗？whether...or not，固定搭配，是否，故选B。
【点评】考查固定搭配，注意whether...or not的用法。
2．___________ you know the answer, please ___________ your hand.A. If; raiseB. If; riseC. Unless; raiseD. Unless; rise【答案】 A3．This is the most important task should be finished soon.A. whichB. whatC. thatD. /【答案】 C4．—Tom, what does "Stay hungry, stay foolish." mean?—You can have your own understanding. But I think it means follow your original aspiration （初心） you will succeed.A. soB. butC. andD. or【答案】 C5．—Mom, I want to be an engineer when I grow up.—Son, your dream will not come true _____ you keep trying your best.A. whenB. whetherC. unlessD. because【答案】 C6．—Could you tell me more about the movie Frozen II __________ you have watched it.—No problem. But you'd better watch it in person __________ I can't express its beauty.A. since; soB. unless; asC. since; as【答案】 C7．Although she is under great stress, ______ she always wears a smile on her face.A. andB. orC. butD. /【答案】 D8．British people and Australian people speak the same language, ______________ they havedifferent customs and cultures.A. andB. butC. soD. for【答案】 B9．He is getting fat, _______________ he has decided to go to work on foot.A. becauseB. thoughC. soD. and【答案】 C10．______________ you use your dictionary often, your spelling will improve.A. WhetherB. IfC. ThoughD. While【答案】 B【解析】【分析】句意：如果你经常使用字典，你的拼写就会变好。
A：Whether是否，不能引导条件状语从句。
B：If是否，可以引导条件状语从句；C：Though虽然；D：While当……时，然而。
根据前后句的意思，可知前句是后句发生的条件，要用连词if，故选B。
【点评】考查连词辨析。
理解连词的意思和用法，根据前后句的关系，选择正确的连词。
11．Tony has learned a lot about Chinese culture ______________ he came to China.A. beforeB. sinceC. untilD. when【答案】 B【解析】【分析】句意：自从来到中国托尼学到很多关于中国文化的东西。
before在……之前；和过去完成时连用；since自从，后跟表示过去的时间状语和现在完成时连用；until直到……才……；不和完成时连用，when当……时候；和过去完成时连用。
故选B。
【点评】连词辨析。
掌握每个连词的使用规则。
12．_____________ she is a very busy woman, she helps the boy.A. AlthoughB. BecauseC. HoweverD. But【答案】 A【解析】【分析】句意：虽然她是个很忙的女人，但是她帮助那个男孩。
A： Although，虽然，表示转折关系。
B： Because，因为，表示因果关系。
C： However，然而，表示转折。
D： But，但是，表示转折。
根据_____________ she is a very busy woman, she helps the boy.可知，她是个很忙的女人和她帮助那个男孩是转折关系，但用在第一个句子前，只能是although，故选A。
【点评】考查连词辨析。
注意连词的意思和区别，结合句意，选出正确答案。
13．In summer, food will go bad quickly we put it into a fridge.A. ifB. unlessC. as soon asD. when【答案】 B【解析】【分析】句意：在夏天，食物会很快的变质，除非我们把它放进冰箱里。
if 如果；unless除非；as soon as一……就……while当……的时候。
根据常识可知在夏天食物放在冰箱才不会马上变质，此处是unless引导的条件状语从句，故选B。
【点评】此题考查连词辨析。
弄清所给连词意思，然后根据上下文的联系确定所使用的连词。
14．Tom won't play computer games __________ he finishes his homework.A. ifB. so thatC. unlessD. although【答案】 C15．—Is your WeChat account （账户） safe?—Yes, even my father can't use it __________ I tell him the password.A. whenB. unlessC. whileD. if【答案】 B【解析】【分析】句意：——你的微信账号安全吗？——是的，甚至我父亲都不能使用，除非我告诉他密码。
when什么时候；unless除非；while当……时候；if如果，根据——Is your WeChat account （账户）safe?—Yes,可知我的账号很安全，所以除非我告诉他密码没人能上我的微信。
故选B。
【点评】此题考查连词辨析。
根据上下文的联系确定所使用的连词。
16．The battle continued for several hours ___________ darkness came on.A. as soon asB. thoughC. sinceD. until【答案】 D【解析】【分析】句意：战争持续了几个小时，直到黑夜来临。
A.一……就……；B.尽管；C.自从；D.直到。
continue是延续性动词，句子所要表达的意思是战争一直持续到了晚上，所以使用until，故答案是D。
【点评】考查连词辨析，注意连词until的用法。
17．—We have red and yellow T-shirt, which color do you like?—I'm afraid . I think blue will be OK.A. bothB. eitherC. neitherD. none【答案】 C【解析】【分析】句意：——我们有红色和黄色的T恤，你喜欢哪种颜色？——恐怕两件都不喜欢。
我认为这件蓝色的不错。
A 两者都；B 两者中的任何一个，要么……要么……；C 两者都不；D 三个或三个以上的都不。
根据句意，可知我选的是蓝色的，红色和黄色的都没有选，故两者都不喜欢，故选C。
【点评】考查连词辨析。
注意识记各连词含义及用法。
18．—Which sport do you prefer，volleyball basketball?—I prefer volleyball.A. orB. andC. but【答案】 A【解析】【分析】句意：——你更喜欢哪个运动，排球还是篮球？——我更喜欢排球。
A.或者，表示选择；B.和，表示并列；C.但是，表示转折。
根据答语可知选择了排球和篮球中的一个，所以用or，故选A。
【点评】考查连词辨析，注意平时识记其词义，理解句意。
19．It's a serious problem. We can't make a decision Mr. Black comes back.A. whileB. sinceC. untilD. so【答案】 C【解析】【分析】这是个严重的问题，我们直到布莱克先生回来才可以做决定。
根据句意此处应是直到布莱克先生回来，我们才可以做决定，not…until…，直到……才……，故选C。
【点评】考查连词，识记not…until…的用法。
20．Drink more water and go to bed early, _______________ you'll feel better tomorrow.A. andB. orC. ifD. unless【答案】 A【解析】【分析】句意：多喝水早睡觉，明天你将感觉更好。
祈使句+and+句子，表示顺承；祈使句+or+句子，表示转折。
多喝水早睡觉就会感觉更好，前后句表示顺承，所以用and，故选A。
【点评】考查祈使句用法，注意平时识记祈使句+and/or+句子。
21．You aren't able to lose weight _______________ you change your eating habits.A. ifB. unlessC. afterD. since【答案】 B【解析】【分析】句意：除非你改变你的饮食习惯，否则你不能减肥。
A.如果；B.除非......否则；C.在......之后；D.自从。