江苏高考英语百日训练之单项填空(14)含答案详解
江苏高考英语百日训练之单项填空(15)含答案详解
江苏高考英语百日训练之单项填空（15）含答案详解第一节单项填空(共15小题；每小题1分，满分15分)请认真阅读下面各题，从题中所给的A、B、C、D四个选项中，选出最佳选项。
21.Whether to favor urban development or the preservation of historical sites is especially controversial in China, where there exists rich history, diversified tradition and cultural ________.A. surplusB. depositsC. accountsD. receipts22.As a(n) ________ and effective method, expressway noise barrier is a primary measure used to reduce traffic noise.A. correctionalB. flexibleC. economicalD. investigative23.Due to the reform and opening-up, our living conditions, undoubtedly, have improved ________ over the past decades.A. consideratelyB. approximatelyC. appropriatelyD. considerably24.I hope that we will be able to make it through the tough times and back to the business of working together ________ our common goals.A. on behalf ofB. in honor ofC. on top ofD. in search of25.She said her ________ is enough to support her in later years and that her only hope is that her son can visit regularly. After all she had not much time left.A. pensionB. benefitC. allowanceD. bonuspeted in 1891, in ________ was known as The Gilded Age, the five-story mansion is now owned by a famous actor who decides to stage a special production of Shakespeare's Hamlet.A. thatB. whatC. whichD. it27.Contrary to popular belief, the ants, hardworking ________ they are, have their time for play.A. becauseB. whileC. asD. where28.When faced with a big challenge ________ potential failure seems to hide at every corner, maybe you've heard this advice before: “Be more confident.”A. whereB. whoseC. whichD. of which29.Peterson, a great archaeologist, said: “Archaeologists have been extremely patient because we were led to believe that the ministry was ________ this problem, but we feel that we can't wait any longer.”A. looking outB. bringing outC. carrying outD. sorting out30.The laptops made by our company sell best, but nobody could have guessed the place in the market that they ________20 years ago.A. had hadB. hadC. were havingD. were to have31.In my driving lesson, a traffic rule that impressed me most is that in no time ________ when the traffic lights turn red.A. all vehicles should stopB. should all vehicles stopC. should stop all vehiclesD. should stop all vehicles32.Frankly speaking, I am not sure whether I ________ this in the old days with that kind of equipment, which looks quite odd and ridiculous.A. should have doneB. need have doneC. would have doneD. must have done33.—I have been considering cancelling the project because it seems hard to go farther.—But it's too early to________ now. There's still much hope.A. pick up the piecesB. throw in the towelC. go through your pacesD. jump down your throat34.________ the concert to raise money for hunger relief and to make the public aware of the problem, Geldof invited many famous musicians to take part in it.A. IntendedB. IntendingC. Having intendedD. To intend35.—Oh, Hannah just told me that she was unable to translate the report into English.—________？She once spent 10 years living in London.A. Guess whatB. Why notC. So whatD. How come21【答案】B【解析】【详解】考查名词辨析。
江苏高考英语百日训练之任务型阅读(14)含答案解析
江苏高考英语百日训练之任务型阅读（14）含答案解析【题文】In workplaces and families across the world, people tend to communicate on the Internet. We send endless emails; we video chat rather than travel across the town to meet. Actually, sitting down and interacting with someone in person can seem like a rare luxury nowadays. But as technology develops, are we losing our ability to connect and empathize (移情) with others?Empathy is the ability to feel another person’s emotions and understand his/her views. In the past few decades, researchers have emphasized our ability to literally read others. The way we usually try to detect other people’s emotions is through their facial expressions—their eyes in particular. We are told that “the eyes are the windows of the soul, and eye contac t is certain critical in empathy.”However, empathy relies on more than reading facial expressions. New research suggests our voice can greatly help us connect. A new study by Michael Kraus from Yale University has found that our sense of hearing may be even stronger than our sight when it comes to accurately detecting people’s emotions. In other words, you may be able to sense someone’s emotional state even better over the phone than in person. Kraus conducted three experiments to arrive at the conclusion. In all these experiments, the participants gave the best performance when they only heard peoples voices (compared to when they looked at facial expressions alone, or looked at facial expressions and heard voices).In several follow-up studies, Kraus directed his attention to why the voice is such a powerful mode of empathy. He asked the participants to discuss a difficult work situation over a video conferencing platform using either just the microphone or the microphone and the video. Once again, the par ticipants were more accurate at detecting people’s emotions in voice-only calls. When we only listen to the voice, he found, we simply focus more on the nuances(细微差别) as the speakers express themselves.How can we get better at interpreting emotions in the voices of our coworkers and loved ones? There isn’t much research so far exploring this question specifically. One study on babies, cries suggested that parents with more musical training were better at distinguishing cries of distress from other types of cries. But, really, we might not need much training. Kraus found that, once you remove other inputs (like facial expressions), your attention naturally sharpens when it comes to voice messages. Besides, the human ability to catch nuances in voices may have offered a strong evolutionary advantage to our ancestors, which helped ensure survival.【答案】51. online/Internet 52. reduces/decreases53. traditional/conventional/previous 54. feeling55. based/dependent 56. accurate/precise57. explanation/result 58. focused/concentrated59. contributor 60. survive【解析】这是一篇说明文。
江苏高考英语百日训练之单项填空(16)含答案详解
江苏高考英语百日训练之单项填空（16）含答案详解第一节单项填空(共15小题；每小题1分，满分15分)请认真阅读下面各题，从题中所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
21.Whether something is alive or dead is a crucial ______ and it is one that children have no difficulty understanding by the age of five.A. declarationB. distinctionC. divisionD. distribution22.It is said that the only survivor in the car crash was badly injured. However, somehow the doctors managed to help him ______.A. pull throughB. put throughC. look throughD. break through23.I had been betrayed by those who I trusted several times, ______ in a suspicious attitude towards everything and everyone.A. resultedB. having resultedC. resultingD. to result24.The style of the campus is quite different from ______ of most Chinese universities where visitors were amazed by the complex architectural space and abundant building types.A. thatB. oneC. the oneD. those25.Maybe some of you are curious about what my life was like on the streets because I’ve never really talked about it ______.A. in placeB. in turnC. in forceD. in depth26.The debate has only a few moments that might be inspiring to those who ______ this issue.A. followedB. had followedC. have been followingD. were following27.Although Mailer was not alone in welcoming the flowering of creativity, the authorities hated it, ______ did many passengers.A. whichB. asC. thatD. so28.I decided to do a random act of kindness last year. And ______ that the person I would end up helping most would be myself.A. I little knewB. little did I knewC. little did I knowD. little I knew29.______ what had happened, they knew I would struggle and simply wanted to help because it was the right thing to do.A. HearingB. To have heardC. Having heardD. Heard30.Sympathy for the rebels, the government claimed, is beginning to ______because of more and more harm they did to common people.A. fadeB. declineC. failD. collapse31.A myth is an account of the deeds of a god or supernatural beings, usually expressed in terms of ______ thought.A. primaryB. capitalC. initialD. primitive32.There are also people who object to fairy stories on the grounds ______ they are not objectively true, and that giants, witches, two-headed dragons etc do not exist.A. thatB. whatC. whichD. when33.Another study of 302 volunteers at hospitals in Chicago focused on individual differences in the degree ______ people view “volunteer” as an important social role.A. by whichB. to whichC. in whichD. from which34.If he had been working hard, he ______ in the office now. However, he didn’t.A. would be workingB. were to be workingC. was workingD. should work35.—I was informed that you won the lottery?—Are you kidding? Maybe I will win a lottery when______.A. you cry for the moonB. pigs flyC. all good things come to an endD. you get a new lease on life21【答案】B【解析】【详解】考查名词词义辨析。
江苏高考英语百日训练之单项填空(12)含答案详解
江苏高考英语百日训练之单项填空（12）含答案详解第一节:单项填空(共15小题；每小题1分，满分15分)请认真阅读下面各题，从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21.Yesterday is history, tomorrow is a mystery, only today is a gift, and that is ______ we call it present.A. howB. whenC. whyD. where22.The whole nation is struggling to work out an inexpensive ______ effective solution to smog.A. yetB. stillC. orD. though23.She runs on average about 15 miles a day every day, ______ the circumstances.A. whateverB. whereverC. whicheverD. however24.When we have a chance to travel, we tend to ______ as many sights into the trip as we can--- seven countries in ten days, for example.A. squeezeB. sneezeC. subscribeD. substituteck of sleep _______ lead to weakened immunity and memory, and also slow physical growth.A. shallB. mustC. shouldD. can26.Abraham set himself up in front of his daughter, hands ________ her hair, and was close to tears, reluctant to tear himself from her.A. to toy withB. toyed withC. toying withD. being toyed with27.Recently, a programmer criticized the “996” work schedule ______ employees work from 9 am to 9 pm, 6 days a week, with the prospect of ending up in an intensive care unit.A. whereB. whenC. whichD. whose28.While his approach was a complete ________ from established practices, the result was satisfactory.A. separationB. prohibitionC. departureD. judgment29.Most spending that results in debt is like a drug: a quick hit of pleasure that ______, only to drag you down for years tocome.A. takes offB. wears offC. sets offD. shows off slang is hugely ______ thanks to the many different ethnic groups that have settled in the country.A. delicateB. dynamicC. diverseD. desperate31.—I’m burnt out as I’ve been working on my essay all the ti me.—____________. You’ll surely make it.A. Don’t put on airsB. Give me a breakC. Don’t get on my nerveD. Hang in there32.Decades ago, scientists believed that how the brain develops when you are a kid ______ determines your brain structure for the rest of your life.A. sooner or laterB. more or lessC. to and fromD. up and down33.After she became ill, I felt ______ with her—she was cheery while I felt gloomy.A. out of tuneB. out of breathC. out of curiosityD. out of mind34.When you are absorbed in a book or simply trying to rest, it seems that the phone ______ continuously, destroying your momentary peace.A. ringsB. has been ringingC. rangD. is ringing35.I'd advise anyone to put aside a proportion of their earnings — ____________.A. nothing great is easyB. nothing comes from nothingC. a bad penny always turns upD. a penny saved is a penny earned21【答案】C【解析】【详解】考查表语从句。
江苏高考英语百日训练之单项填空（4）含答案详解
江苏高考英语百日训练之单项填空（4）含答案详解江苏高考英语百日训练之单项填空（4）含答案详解1.We live in this society now ________ literally someone is always helping.A. whenB. whereC. thatD. what2.The maple trees turn a brilliant red in autumn, adding another to the colors in the harvest season.A. themeB. versionC. categoryD. dimension3.Patrick waited ________ all the luggage was cleared, but his never appeared.A. untilB. beforeC. whenD. while4.—Look! Mary is crazily looking for something again!—_____ , she can’t find her keys.A. TypicallyB. OccasionallyC. AccordinglyD. Particularly5.Cambridge gave a positive answer inquiries on whether it recognizes gaokao scores.A. in favor ofB. in response toC. in salute toD. in consequence of6.Wild animals in nature reserves need to develop their survival skills and their wild nature.A. displayB. possessC. maintainD. monitor7.I’d never wondered before whether or not he was kid-friendly. With one glance, I qu ickly that he probably wasn’t.A. agreedB. reportedC. explainedD. decided8.Th e same boiling water softens the potato and hardens the egg. It’s about ________you’re made of, not the circumstances.A. thatB. whatC. howD. who9.— Excuse me, do you mind if I open the window?— Well, if you __________. I can put on more clothes.A. canB. mayC. mustD. shall10.With the number of homecoming overseas students ________ up in recent years, the attraction of foreign degreeholders has gradually faded.A. shotB. being shotC. shootingD. to shoot11.--- Have you heard that they are working around the clock to compete for the prize?--- Don’t worry. We are ready to the challenge.A. build upB. take upC. stick toD. lead to12.--- Is there any chance of my being promoted?--- If you want a promotion, you’d better rather than get your way.A. play the gameB. cross your fingersC. raise the red flagD. kill the fatted calf13.— How could they misunderstand me like that?—Just keep silent! It’s the best way t o let them know they you wrong.A. doB. didC. are doingD. had done14.Our team is world-class and it was no surprise that we won by such a margin.A. lowB. highC. wideD. narrow15.--- I’ll take the blue one. This is twenty dollars.--- Here’s the change. .A. Best wishesB. My pleasureC. Have a nice dayD. Let’s ca ll it a day1【答案】B【解析】【详解】考查定语从句连接词。
江苏高考英语百日训练之单项填空(26)含答案详解
江苏高考英语百日训练之单项填空（26）含答案详解第一节单项填空(共15小题；每小题1分，满分15分)请认真阅读下面各题，从题中所给的A、B、C、D四个选项中，选出最佳选项。
21.Encouraged by his father，my cousin quickly developed a for table tennis，and specialized in the sport later.A.tasteB.talentC.concernD.plan22.About 70 to 75 bicycles will be to Jacksonville according to a bike-share program that VeoRide，an Indiana company，is expected to roll out later this year.A.appliedB.classifiedC.circulatedD.allocated23.By the end of October,214 project agreements with investors from outside Hainan，according to the Hainan Provincial Department of Commerce.A.have been signedB.had been signedC.have signedD.had signed24.It won’t be long before we complete our scheme. you want to make any change，please keep me informed before tomorrow.A.ShallB.CouldC.ShouldD.Might25.When Jackson was young，he was really a child，always hanging out，coming home late and making his parents upset.A.contraryB.contradictoryC.conservativeD.considerate26.This plan looks good ，but few people believe that it will work in a real-world environment.A.on averageB.on paperC.in placeD.in store27.The second season of Memoirs of Canton, a documentary series Cantonese culture，ran on CCTV’s documentary channel recently.A.having reflectedB.to reflectC.reflectingD.reflected28.If your skin easily，it’s important to wear sun-protective clothing or a high SPF sunscreen to protect your skin from the sun.A.burnsB.was burntC.will burnD.is burning29. it took China 30 years to finally release the classic Japanese animation My Neighbour Totoro in mainland cinemas，fans of Hayao Miyazaki felt delighted.A.UnlessB.SinceC.Now thatD.Even though30.One of the features of the hotel to be built next month is that it should at least 90 percent of the area for non-smokers.y downB.put awayC.set asideD.give out31.With her light hair and blue eyes，Mary seems to her mother，but in character she is more like her father.A.take toB.take onC.take inD.take after32.Against medical experts have been saying for years，a new study suggests salt may not be as bad for the heart as commonly believed.A.thatB.whichC.whatD.how33.It’s here.I can’t get a job because I haven’t got any experience，but without a job，how can I get experience?A.a wet blanketB.a catch-22C.a white lieD.a tough nut34.All of us couldn’t understand why he left without saying anything in such an important event _________ we expected to hear his voice.A.thatB.whichC.whenD.where35.—I’ve decided to go back to school for some training in programming.—，Philip.When would you like to start?A.Good for youB.You said itC.You are kidding meD.Take my word for it21答案 A解析句意为：在他父亲的鼓励下，我的堂弟很快喜欢上了乒乓球，后来专攻了这项运动。
江苏高考英语百日训练之单项填空(35)含答案详解
江苏高考英语百日训练之单项填空（35）含答案详解第一节单项填空(共15小题；每小题1分，满分15分)请认真阅读下面各题，从题中所给的A、B、C、D四个选项中，选出最佳选项。
21.As an American living in Tianjin for about 10 years，Chris says that it has been a to be a witness to China’s great progress.A.privilegeB.preferenceC.priorityD.principle22.Throughout its early years，what we now call hip hop without even having a name.A.evolvedB.is evolvedC.had evolvedD.evolves23.Scarcely myself comfortable and closed my eyes when I heard the sound of the alarm.A.I gotB.I had gotC.did I getD.had I got24.The relationship between employers and employees has been studied .A.originallyB.extremelyC.violentlyD.intensively25.People spend half their time dreaming of getting rich，and the rest of their time thinking about all the things they if they got rich.A.will doB.didC.doD.would do26.A Chinese proverb has it that “A tower is built when soil on earth ，and a river is formed when streams come together.”A.accumulatesB.acceleratesC.collapsesD.loosens27.—That was rather a tough question.How did you get it right?—To tell the truth，I just .A.burnt the midnight oilB.was left to sink or swimC.played it safeD.took a shot in the dark28.—I have to go now because I must be for class.—What a pity! See you!A.modestB.punctualC.desperateD.adequate29.It is said that the only survivor in the car crash was badly injured.However，somehow the doctors managed to help him .A.pull throughB.put throughC.look throughD.break through30. related industries，Beijing will also commit to promoting the Intelligent Connected Vehicle (ICV) industry，whose future market is huge.A.In virtue ofB.In terms ofC.On top ofD.On behalf of31.—What does the sign over there read?—“No person smoke or carry a lighted cigarette or pipe in this restaurant.”A.willB.shallC.needD.must32.Blog discussions may be closed to new comments， a message is displayed informing you of that.A.in what caseB.in that caseC.in whose caseD.in which case33.The mayor，writing the report，turned off the light，closed the door and went directly to his bedroom.A.to finishB.finishedC.finishingD.having finished34.Try she might，Sue couldn’t get the door open.A.ifB.whenC.sinceD.as35.—So you missed the wonderful lecture given by the famous professor?—.I got there 10 minutes before it finished.A.You got me thereB.You said itC.I hate to say itD.Not exactly21答案 A解析考查名词辨析。
高考英语百日训练之语法填空(14)含答案解析
高考英语百日训练之语法填空（14）含答案解析【题文】Marian Bechtel sits at West Palm Beach’s Bar Louie counter by herself, quietly reading her e-book as she waits for her salad. What is she reading? None of your business! Lunch is Bechtel’s “me” time. And (21)________ more Americans, she’s not alone.A new report found 46 percent of meals are eaten alone in America. More than half (53%) have breakfast alone and nearly half (46%) have lunch by themselves. Only at dinnertime (22)________ we eating together, 74%, according to statistics from the report.“I prefer to go out and be out. Alone, but together, you know?” Bechtel said, (23) _______ (look) up from her book. Bechtel, who works in downtown West Palm Beach, has lunch with coworkers sometimes, but like many of us, too often (24)________(work) through lunch at her desk. A lunchtime escape allows her to keep a boss from tapping her on (25)________ shoulder. She returns to work feeling energized. “Today, I just wanted some time to myself,” she said.Just two seats over, Andrew Mazoleny, a local videographer, is finishing his lunch at the bar. He likes that he can sit and check his phone in peace or chat up the barkeeper with whom he’s on a first-name basis (26)________ he wants to have a little interaction. “I reflect on (27)________ my day’s gone and think about the rest of the week,” he said. “It’s a chance for self-reflection. You return to work (28)________(refresh) and with a plan.”That freedom (29)________(choose) is one reason more people like to eat alone. There was a time when people may have felt awkward about asking for a table for one, but those days are over. Now, we have our smartphones to keep us company at the table. “It doesn’t feel as alone as it may have before all the advances in technology,” said Laurie Demeritt, (30)________ company provided the statistics for the report.【答案】21. like 22. are 23. looking 24. works 25. the 26. if/when 27. how 28. refreshed 29. to choose 30. whose【解析】【标题】上海市闵行区2020届高三上学期质量调研考试（一模）英语试题【结束】。
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江苏高考英语百日训练之单项填空（14）含答案详解第一节单项填空（共15小题；每小题1分，满分15分）请认真阅读下面各题，从题中所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该项涂黑。
1.Only the hope that the rescuers were getting nearer the trapped miners.A. suspendedB. subscribedC. sustainedD. suspected2.From my point o f view, there’s little chance that we will be successful in trying to change the present situation. ________, it is important that we try our best.A. MeanwhileB. OtherwiseC. ThereforeD. Nevertheless3.“It might have saved me a lot of money”, Mr. Chen sighed, “________ timely from the stock market this July”.A. did I withdrawB. should I withdrawC. have I withdrawnD. had I withdrawn4.One of the true tests of leadership is the ability to recognize a problem ________ it becomes an emergency.A. whenB. beforeC. afterD. unless5.Considered to be a less dangerous to tobacco, "e-cigs" are taking over the West as more and more people switch over when trying to kick the habit.A. adjustmentB. alternativeC. advertisementD. amusement6.Helen said that she would bring me Justin Bieber's latest CD the next day, but she .A. wouldn'tB. didn'tC. hadn' tD. hasn't7.You can’t imagine how excited we were ________ that our schoolmates had won the first place in National Robot Competition.A. learningB. having learnedC. to be learningD. to learn8.—________ the woman with the baby come over? We have a seat here.—Thank you, sir. Actually I do have my seat here. But my baby likes to look out of the window.A. WouldB. ShallC. MustD. May9.As a result of ________ is now known in physics and chemistry, scientists have been able to make important discoveries in biology and medicine.A. whatB. itC. whichD. that10.The drums of war are beating once again. As tensions rise between America and Iran, China appeals to both sides to ________.A. stand byB. come alongC. step backD. stick together11.Locals lived in rather ________ conditions until the founding of the People’s Republic of China in 1949.A. preciousB. primitiveC. preciseD. prior12.—Oh, my God! What’s wrong with you?—I was going the normal speed limit when a truck appeared in front of me ________ and I didn't have time to stop.A. between the linesB. around the clockC. out of the blueD. over the moon13.Music treatment involve s a specialist playing an instrument or sing ________ the patient’s mood.A. by means ofB. with regard toC. in response toD. on account of14.Russia's cutting off the gas supply raised a major concern to the European Union, a number of member states are increasingly dependent on one single supplier.A. whoseB. thatC. whereD. which15.—I forgot to register for the courses. I’m one day late and most of the classes are full. What shall I do?—________ You can’t do anything about that.A. Take your time. B. Poor you! C. So what? D. No way! 1【答案】C 【解析】【详解】考查动词词义辨析。
句意：救援者越来越近，这唯一的希望支撑着深陷井下的矿工们（生存的信念）。
A.suspended悬挂；B. subscribed订阅；C. sustained维持，支撑；D. suspected怀疑。
分析句子可知，that the rescuers were getting nearer为同位语从句解释说明hope内容，根据语境，希望支撑着矿工，故选C。
2【答案】D【解析】【详解】考查副词词义辨析。
句意：在我看来，改变目前情形成功的可能性很小。
尽管如此，尽我们最大的努力依然是很重要的。
A. Meanwhile与此同时；B. Otherwise否则；C. Therefore因此；D. Nevertheless尽管如此。
分析前后句可知，前一句讲成功的可能性小，但是依然要努力尝试，前后为转折关系，故选D。
3【答案】D【解析】【详解】考查虚拟语气。
句意：陈先生叹气道：“如果在7月我能及时从股市中出来的话，我可能就不会损失很多钱了。
”分析句子可知，本句为虚拟语气的条件状语从句，根据It might have saved me a lot of money可知，是对过去的虚拟，故从句用过去完成时，省略if，则把助动词had放在句首，故选D。
【点睛】虚拟语气。
虚拟语是一种表示假设状态的句型，是一种特殊的动词形式；表示所说的话不是一个事实，而只是说话者的一种假设，或不大可能实现的空想。
根据虚拟语气的特点我将其分成了四大块，请往下看。
虚拟语气用在条件状语从句中，根据时态的不同，主从句的谓语动词可分为以下3种情况1.与现在事实相反的虚拟语气——过去时，例：If he studied harder，he might pass the exam（如果他努力学习，他可能通过考试了）使用要点：不论主语为第几人称，if从句中的be动词均用were；主句中的助动词一定为过去时，且后面接动词原形，例1：IfI were you，I would beat him.例2：If he were here，I would beat him.2. 与过去事实相反的虚拟语气——过去完成时，使用此句型时从句中会出现had had的情况，同学们要注意区分had 与had had区别，例1：If he had money，he would buy a car.（如果他有钱，他会买辆车）此句中had为一般过去时动词，翻译为“有”例2：If he had had money，he would have bought a car.（如果他那时有钱，他就会买辆车）此句中第一个had为过去完成时助动词，第二个had为have（有）的过去分词。
3. 与将来事实相反的虚拟语气——主句用过去时，例：If it should rain，the game would be put off.（如果下雨，比赛会推迟）使用要点：if从句一定要加助动词should，if……should翻译为“万一”；4【答案】B【解析】【详解】考查连词词义辨析。
句意：领导能力的真正考验之一是有能力在成为紧急情况之前就识别到问题。
A. when 当……时；B. before在……之前；C. after在……之后；D. unless除非。
能够在问题严重之前就意识到问题是领导能力强的标志，故选B。
【点睛】before的用法before在英语中是一个比较常用的虚词，它既可作介词或副词用，也可作从属连词用。
在近几年的高考试题中常常出现考查其从属连词用法的题目。
下面就把其作为从属连词的用法归纳如下：1. 表示“在……之前就……”。
Mary had finished her homework before her mother returned.2. 表示“过了多久后才……，动作进行到什么程度才……”。
The man almost knocked me down before he saw me.They worked day and night about three days before everything returned to normal.3. 表示“来不及；尚未……就……”。