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初三英语条件状语从句单选题40题1. If it ______ tomorrow, we will have a picnic in the park.A. don't rainB. doesn't rainC. won't rainD. not rain答案：B。
解析：这是一个条件状语从句。
在条件状语从句中，如果主句是一般将来时，从句要用一般现在时表将来。
it是第三人称单数，否定形式是doesn't rain。
A选项don't用于第一、二人称和复数主语；C选项won't rain是一般将来时，不符合条件状语从句的时态要求；D选项not rain形式错误。
2. I will buy you a new bike ______ you get good grades this semester.A. ifB. whenC. becauseD. though答案：A。
解析：本题考查条件状语从句的引导词。
if表示如果，引导条件状语从句，符合句子语境，如果这学期你取得好成绩，我就给你买一辆新自行车。
when引导时间状语从句，表示当的时候；because引导原因状语从句，表示因为；though引导让步状语从句，表示虽然。
所以B、C、D选项均不符合题意。
3. You can't go out to play football ______ you finish your homework.A. untilB. ifC. sinceD. so答案：A。
解析：这里考查的是条件状语从句相关的搭配。
not...until 表示直到才，句子的意思是直到你完成作业才能出去踢足球。
if表示如果，不符合句子逻辑；since表示自从或者因为，与句子语境不符；so表示所以，是表示因果关系的连词，也不符合题意。
4. ______ you are late for school again, the teacher will be angry.A. BeforeB. IfC. AfterD. While答案：B。
中考英语条件状语从句单选题30题1. If it ______ sunny tomorrow, we will go for a picnic.A. isB. wasC. will beD. has been答案：A。
本题考查条件状语从句中“主将从现”的原则。
从句用一般现在时，主句用一般将来时。
A 选项“is”是一般现在时，符合语法规则；B 选项“was”是一般过去时，不符合条件状语从句的时态要求；C 选项“will be”是一般将来时，不能用在从句中；D 选项“has been”是现在完成时，也不符合从句的时态要求。
2. We won't go to the park unless it ______ rainy tomorrow.A. isB. isn'tC. will beD. won't be答案：B。
在条件状语从句中，unless 相当于if...not。
根据句意，“除非明天不下雨，否则我们不去公园”，A 选项“is”表示下雨，不符合句意；C 选项“will be”和D 选项“won't be”时态错误，从句要用一般现在时；B 选项“isn't”表示不下雨，符合条件状语从句的语法规则和句意。
3. If you ______ hard, you will pass the exam.A. studyB. studiedC. will studyD. studies答案：A。
条件状语从句遵循“主将从现”原则，A 选项“study”是一般现在时；B 选项“studied”是一般过去时，不符合要求；C 选项“will study”是一般将来时，不能用在从句中；D 选项“studies”是第三人称单数形式，此处主语是you，不需要用第三人称单数。
4. I will call you if I ______ free this afternoon.A. amB. wasC. will beD. have been答案：A。
英语中考英语状语从句专项综合练习带答案解析一、选择题1．—_________ I have tried many times, I can't work it out.—Don't give up and let's have another try together.A．Since B．Because C．Unless D．Though2．Don't be afraid of asking for help ________ it is needed.A．unless B．until C．although D．when3．There will be fewer accidents _______ all of us obey the traffic rule.A．if B．unless C．though D．because 4．Mr. Page still plans to take up a new hobby ________ he is almost 70 years old. A．though B．because C．if D．while 5．Smiling is the best policy. People will smile back ________ you smile at them.A．unless B．although C．until D．when6．Many people do not realize the importance of health _________ they have fallen ill. A．until B．while C．when D．after7．___________ I hear Kenny G's recording Going Home, I always think of my hometown. A．While B．Since C．Until D．Whenever 8．—The novel written by Stephen seems a bit boring to me.—___________ you put your heart into it, you won't enjoy it.A．When B．If C．After D．Unless9．In ancient times, people seldom travelled long distances and most farmers only travelled________ the local market.A．longer than B．more than C．as much as D．as far as 10．The old couple insist on living in a small village among the mountains __________ they can get closer to nature.A．until B．unless C．even though D．so that 11．We’re not very close friends________ we’ve known each other for a long time.A．until B．although C．as D．if12．Sam thought his robot broken ________ Jim pointed out that he’d forgotten to turn it off. A．until B．unless C．after D．as soon as 13．—_______ Dr. Zhong Nanshan knew that COVID-19 was a deadly new virus, he still went to Wuhan in Central China to help the local people.—He is really a brave and kind doctor.A．If B．As soon as C．Because D．Although 14．You will be out of date ________ you keep on studying from time to time.A．unless B．although C．if D．otherwise 15．It’s almost three years ________we saw each other last time.A．since B．after C．when D．before 16．Benny, monitor of our class, is such ________ honest boy that we all trust him.A．a B．an C．the D．/17．— I never knew you could make such delicious handmade noodles.—I learned it from an app ________ I stayed at home during the lockdown (封锁).A．since B．before C．when D．until18．—It's time for me to go back home now.—Really? ________ you have to go, take the umbrella, it's raining outside.A．If B．When C．Until D．Unless19．I'm sure you can catch up with others _______ you work hard.A．until B．if C．unless D．though 20．—More and more people like shopping online now.—I agree. My sister will be crazy about it ________ my parents give her enough money.A．if B．unless C．when D．while21．— What do you think of Spud Webb, the shortest player in the NBA?一 Amazing, ________he was refused many times at first.A．unless B．though C．since D．because 22．—The local snack tastes spicy and sweet.—Well, ___________ you are here, why not have a try?A．since B．because C．though D．unless23．Dr. Smith will never leave his parents ________ he is sure both of them are taken good care of.A．since B．though C．if D．unless24．It’s sad to hear that 19 people lost their lives ________ they were fighting with the forest fire in Liangshan, Sichuan.A．as soon as B．after C．while D．until25．—Did you watch the News Network Show yesterday?— Yes, of course. I never miss it ________ I have too much homework.A．unless B．until C．if D．since 26．—Lucy, you can come to me for help ________ you get into trouble in your study at school.—Thanks, David. You are always helpful.A．although B．unless C．when D．since27．—You look so sad. What happened?—The home for the elderly will be closed ________ it can get more donations.A．since B．unless C．if D．because28．He realized his mistakes and took action to reduce the loss ________ it was too late. A．before B．unless C．if D．until29．Jack is still working to high standards ________ he has made great achievements.A．until B．if C．though D．because 30．The game show was so funny that he watched it for hours ________ he realized it.A．as B．since C．before D．after31．________ more and more people surf the Internet for news, the traditional newspaper maynot disappear in a short time.A．Because B．If C．Though D．When32．—I hear you are going to visit Disneyland next month. May I go there with you?—I’m afraid not, ________ you have a ticket.A．if B．unless C．until D．as soon as 33．—Look! Someone is running the red lights.—We should wait ________ others are breaking the rules.A．although B．because C．unless D．if34．Jack has made great progress ________ he joined the English club.A．when B．since C．while D．before 35．Andrew thought there was something wrong with his robot ________ Samuel pointed out that he probably forgot to change the battery.A．until B．if C．after D．since36．— Why did your mother get ________ with you just now?—Because I made ________ many mistakes in the exam that she ________ controlled her feelings when she heard it.A．satisfied; so; really B．satisfied; such; nearlyC．angry; so; hardly D．angry; such; mainly37．________ that moment, I never realized how much my father loved me.A．At B．Unless C．Until D．Since38．________ Jane couldn’t see his face, she could tell by his voice that he was a middle-aged man.A．Unless B．Although C．If D．Until39．The pollution in the sea will be terrible ________ the Japanese government gives up their plan.A．until B．unless C．because D．if40．Mr. Wang, can I go to play football with my classmates ________ school is over?A．as soon as B．as well as C．as good as D．as many as 41．You will never grow ________ you try to do something beyond your abilities.A．when B．since C．though D．unless 42．—What is our head teacher like?—Oh, he is very kind ________ he looks very serious.A．because B．though C．if D．when43．________ I have solved it, you can't imagine how much difficulty I faced.A．Because B．Although C．Unless D．When44．_______ the outbreak of COVID-19 is a terrible blow to the country, the government is trying hard to bring the situation under control.A．Although B．If C．Unless D．However45．In summer, milk quickly goes bad ________ it is put into a fridge.A．though B．unless C．because D．once46．________ more and more people surf the Internet for news, the traditional newspaper may not disappear in a short time.A．Because B．Since C．Though D．Unless 47．—Labour education is an important course for students’ self-development.— Exactly. schools put it into practice, students will learn a lot.A．While B．Unless C．If D．As48．Mr. Picky won’t want to eat it ________ he’s really hungry, in which case he’ll eat almost anything.A．because B．when C．before D．unless49．The theatre will have to close ________ the government agrees to give extra money.A．if B．unless C．because D．until50．—Too much homework has made me tired these days, Miss Wang.—That’s true. But a small tree won’t grow into a big tree ________ it experie nces lots of winds and rains.A．if B．while C．when D．unless【参考答案】***试卷处理标记，请不要删除一、选择题1．D【详解】句意：——尽管我已经尝试很多次了，但是我还是不能计算出来。
中考英语状语从句练习题30题(答案解析)1.We were having dinner when he_____.esB.cameC.will comeD.is coming答案解析：B。
“were having”表明是过去进行时，“when”引导的时间状语从句要用一般过去时，所以选came。
comes 是一般现在时第三人称单数形式；will come 是一般将来时；is coming 是现在进行时表示将来，都不符合语境。
2.I will call you as soon as I_____home.A.getB.gotC.will getD.am getting答案解析：A。
“as soon as”引导的时间状语从句遵循“主将从现”原则，主句用一般将来时，从句用一般现在时，所以选get。
got 是一般过去时；will get 是一般将来时；am getting 是现在进行时表示将来，都不符合要求。
3.She was reading a book while he_____TV.A.watchedB.was watchingC.watchD.will watch答案解析：B。
“while”引导的时间状语从句，主从句动作同时发生，都用进行时态，主句是过去进行时，从句也用过去进行时，所以选was watching。
watched 是一般过去时；watch 是一般现在时；will watch 是一般将来时，都不符合语境。
4.He_____his homework after he comes back from school.A.doesB.didC.will doD.is doing答案解析：C。
“after”引导的时间状语从句，从句用一般现在时表将来，主句用一般将来时，所以选will do。
does 是一般现在时第三人称单数形式；did 是一般过去时；is doing 是现在进行时，都不符合要求。
初三英语状语从句练习题40题(带答案)1. I was reading a book ____ my mother came back home.A. whenB. whileC. asD. since答案解析：A。
when引导时间状语从句时，既可以表示从句动作与主句动作同时发生，也可以表示从句动作先于主句动作发生。
在此句中，当妈妈回家这个瞬间动作发生时，我正在读书，所以when合适。
while引导的从句中的动词必须是延续性动词，come是短暂性动词，所以B错误。
as表示两个动作同时进行，强调一边一边，这里不符合语境，C错误。
since表示自从，引导原因状语从句或者时间状语从句表示从过去某一时间点开始一直持续到现在，与本题语境不符，D错误。
2. ____ he was a child, he liked to play football.A. WhileB. WhenC. AsD. Because答案解析：B。
when可以表示在某个时间段内，当他还是个孩子的时候，他喜欢踢足球，这种情况下用when合适。
while表示在某个动作进行的同时，这里强调的是当他处于孩子这个阶段，不是强调同时进行，A错误。
as表示随着的时候，更强调动作同时发展变化，C 错误。
because引导原因状语从句，这里不是因果关系，D错误。
3. She didn't go to bed ____ she finished her homework.A. untilB. whileC. asD. when答案解析：A。
until表示直到，她直到完成作业才去睡觉，这是not...until...的用法，表示直到...才...。
while引导的从句中的动词要是延续性动词，finish是短暂性动词，B错误。
as表示随着或者当...时，不符合语境，C错误。
when表示当...时，这里强调直到作业完成这个时间点，D错误。
4. ____ the bell rang, all the students rushed out of the classroom.A. As soon asB. WhileC. SinceD. Before答案解析：A。
中考英语状语从句专项训练及答案一、初中英语状语从句1. We don't know the love of our parents _______ we become parents ourselves one day.A. untilB. afterC. whenD. since【答案】A【解析】句意: 直到有一天我们成为父母, 才知道父母的爱。
本题考查连词。
A.until到…为止, 在…以前; 直到…才;B.after在…以后;C.when当···时候；D.since自从; 从…以来;Not until 直到···才···；不到···不···, 是固定搭配, 故选A。
2. — I see Bob, he’s always listening to music.—Yeah, he’s crazy about it.A. WheneverB. AlthoughC. Since【答案】A【解析】【详解】句意“-无论我什么时候看到鲍勃, 他总是在听音乐。
-是的, 他对音乐很疯狂”。
A.无论何时（引导时间状语从句）；B.尽管（引导让步状语从句）；C.自从（引导时间状语从句）。
根据句意可知, 译为“无论何时”, 故选A。
3. —The novel seems a little boring.—You won’t enjoy it _______________ you put your heart into it.A. whenB. ifC. afterD. unless【答案】D【解析】试题分析: 句意: --这部小说似乎有点儿无聊。
--如果你不用心读的话, 你不会享受到这本书。
when, 当……的时候；if如果；after在……之后；unless, 如果不, 除非。
中考英语状语从句练习题30题答案解析版1. I will call you ____ I get to Paris.A. as soon asB. whileC. untilD. since答案：A。
解析：本题考查时间状语从句的引导词。
as soon as表示一就，主句I will call you是一般将来时，从句I get to Paris是一般现在时，在时间状语从句中，遵循主将从现原则，即主句是将来时态，从句用一般现在时表将来。
while强调主从句动作同时发生，通常用于进行时态；until表示直到，不符合此处语境；since表示自从，引导原因状语从句或时间状语从句（主句通常用现在完成时），这里表示一到达巴黎就打电话，所以选A。
2. We will have a picnic in the park ____ it doesn't rain tomorrow.A. ifB. althoughC. becauseD. so答案：A。
解析：这是一个条件状语从句。
if表示如果，引导条件状语从句，从句it doesn't rain tomorrow用一般现在时，主句We will have a picnic in the park是一般将来时，遵循主将从现原则。
although 表示虽然，引导让步状语从句；because表示因为，引导原因状语从句；so表示所以，是并列连词，这里表达如果明天不下雨就去野餐，所以选A。
3. ____ she was reading a book, her mother came in.A. WhenB. AfterC. BeforeD. Since答案：A。
解析：本题考查时间状语从句的引导词。
when可以表示当的时候，从句she was reading a book（过去进行时），主句her mother came in（一般过去时），强调在读书这个动作进行过程中，母亲进来这个动作发生。
中考英语条件状语从句分析单选题40题1.If it rains tomorrow, we _____ stay at home.A.willB.wouldC.shouldD.must答案：A。
本题考查条件状语从句中“主将从现”的用法。
if 引导的条件状语从句用一般现在时，主句用一般将来时。
选项A“will”表示将来；选项B“would”用于过去将来时或表示委婉语气；选项C“should”表示应该；选项D“must”表示必须。
只有A 符合条件状语从句的语法规则。
2.If you study hard, you _____ pass the exam.A.canB.couldC.mayD.might答案：A。
“如果你努力学习，你就能通过考试。
”根据条件状语从句“主将从现”的规则，主句应该用can 表示能够。
could、might 表示可能性比can 小，may 也表示可能。
只有can 最符合表达能通过考试的意思。
3.If she _____ enough time, she will finish the work.A.hasB.haveC.hadD.will have答案：A。
条件状语从句遵循“主将从现”，从句用一般现在时，主语she 是第三人称单数，所以用has。
have 用于第一、二人称和复数；had 用于过去时；will have 用于将来时，都不符合条件状语从句的语法规则。
4.If it _____ sunny tomorrow, we will go for a picnic.A.isB.wasC.will beD.would be答案：A。
“主将从现”，从句用一般现在时，it 后面用is。
was 用于过去时；will be 和would be 用于将来时，不符合条件状语从句语法规则。
5.If he _____ late again, the teacher will be angry.A.isB.wasC.will beD.would be答案：A。
中考英语状语从句练习题30题含答案解析1. I will call you ____ I arrive in Beijing.A. as soon asB. whileC. untilD. since答案：A。
解析：本题考查时间状语从句引导词的用法。
as soon as表示一就，从句用一般现在时表将来，主句用一般将来时，符合句子语境。
while强调主句和从句动作同时进行，这里不符合题意。
until 表示直到，通常主句为否定句，与本题不符。
since表示自从，引导的从句通常用一般过去时，主句用现在完成时，也不符合本题。
2. ____ she was reading, her mother came into the room.A. WhenB. BeforeC. AfterD. Since答案：A。
解析：本题考查时间状语从句引导词。
when可表示当的时候，从句中的动作可以是短暂性的也可以是持续性的，这里read 是持续性动作，when符合语境。
Before表示在之前，After表示在之后，均不符合句子逻辑。
Since表示自从，与本题逻辑不符。
3. We will go to the park ____ it doesn't rain tomorrow.A. ifB. thoughC. becauseD. so答案：A。
解析：本题考查条件状语从句（可视为一种特殊的时间状语从句）。
if表示如果，引导条件状语从句，从句用一般现在时表将来，主句用一般将来时，这里表示如果明天不下雨就去公园。
though 表示虽然，because表示因为，so表示所以，均不符合题意。
4. You can't see the stars clearly ____ there is too much light pollution.A. whereB. whenC. ifD. because答案：D。
解析：本题考查原因状语从句。
初三英语结果状语从句单选题50题1. The math problem was ____ difficult ____ few students could work it out.A. so; thatB. such; thatC. too; toD. very; that答案：A。
解析：本题考查结果状语从句。
so...that和such...that 都表示“如此...以至于”。
so后面接形容词或副词，such后面接名词。
这里difficult是形容词，所以要用so...that结构。
选项C“too...to”表示“太...而不能”，后面接动词原形，不符合题意。
选项D“very...that”没有这种用法。
2. He ran ____ fast ____ he won the first prize in the race.A. so; thatB. such; thatC. too; toD. enough; to答案：A。
解析：fast是副词，结果状语从句中修饰副词用so...that 结构。
选项B“such...that”用于修饰名词。
选项C“too...to”结构中to后接动词原形，这里不符合。
选项D“enough...to”用法错误。
3. It was ____ a heavy box ____ I couldn't lift it.A. so; thatB. such; thatC. too; thatD. very; that答案：B。
解析：本题中a heavy box是名词短语，这种情况下要用such...that结构。
选项A“so...that”用于接形容词或副词。
选项C“too...that”无此用法。
选项D“very...that”用法错误。
4. The movie is ____ interesting ____ many people want to see it again.A. so; thatB. such; thatC. too; toD. very; that答案：A。
中考专项训练状语从句选择题练习一、初中英语状语从句1．-Is your WeChat account （账户） safe?-Yes, even my father can't use it __________ I tell him the password.A．when B．unless C．while D．if【答案】B【解析】【详解】句意：-你的微信账号安全吗？-是的，如果我不告诉他密码甚至我的爸爸都不能使用它。
when当…时候；unless除非，如果不；while当…时候；if如果。
根据句意my father can't use it…可知，这里应表示“不告诉他密码”，故应选B。
2．_______riding shared bikes is an easy way to travel, it also causes some problems. A．Although B．If C．Until【答案】A【解析】【详解】句意：虽然骑共享单车是一种简单的旅行方式，但也会引起一些问题。
A. Although尽管，虽然；B. If如果；C. Until直到。
根据下文it also causes some problems.可知上文是Although 引导的让步状语从句。
根据题意，故选A。
3．I won't go he comes back.A．until B．while C．when D．why【答案】A【解析】句意：直到他回来，我才走。
A. until 直到； B. while当---时候； C. when当---时候； D. why为什么；not---until--- 直到---才---；故选A4．---Would you like to go bike riding with us tomorrow? ---Sure, ____ I am busy.A．since B．unless C．when D．until【答案】B【解析】试题分析：句意：----你想要明天和我们一起去划船吗？好的，如果我不忙我就去。
A自从；B如果不；C当……时候；D直到……才。
根据句意，应选B。
考点：考查连词。
5．She was happy to get a gift from her friend, _________it was only a card.A．if . B．unless C．though D．because【答案】C【解析】【详解】句意：她很高兴从她的朋友那里得到一份礼物，虽然只是一张卡片。
考查连词辨析。
if如果，表条件；unless除非，表条件；推后尽管，表让步；because因为，表原因。
本句是让步状语从句，根据句意结构和语境，可知选C。
6．You are sure to fail the exam ________ you study hard.A．if B．unless C．since D．that【答案】B【解析】试题分析：句意：如果你不努力学习，你一定会考试不及格的。
A.if如果；B. unless如果不；C. since自从；结合句意，故选B。
考点：考查连词的用法。
7．China Dream will be able to come true we try our best.A．unless B．until C．although D．as long as【答案】D【解析】【详解】句意：只要我们尽全力，中国梦将会实现。
考查连词。
A. unless除非；B. until直到；C. although虽然；D. as long as只要。
根据句意可知，是只要我们尽全力，中国梦将会实现。
故选D8．We’ll go to the farm and help the farmers with the apple-picking if it ______tomorrow. A．isn’t rain B．will be rainy C．doesn’t rain D．is raining【答案】C【解析】【详解】句意：如果明天不下雨我们将会去农场帮农民摘苹果。
考查条件状语从句。
根据题干We’ll go to the farm and help the farmers with the apple-picking if it ______tomorrow.可知，if引导的条件状语从句，主句用将来时，从句需用一般现在时，句意是“明天不下雨”，rain是实意动词，主语是it，变否定用助动词doesn’t。
故选C。
【点睛】主将从现是指在时间状语从句和条件状语从句中，如果主句是一般将来时，从句用一般现在时替代一般将来时。
常见的有以下四种情况：一、条件状语从句的主句是一般将来时，那么从句常常用一般现在时如：When I grow up, I’ll be a nurse and look after patients我长大后要当一名护士，照顾病人二、如果主句是祈使句，那么从句通常要用一般现在时如：Don’t laugh at me when I make a mistake.我犯错误的时候不要笑话我。
三、如果主句是含有情态动词的一般现在时，根据需要从句多用一般现在时如：You should be quiet when you are in the reading room在阅览室时应保持安静四. 如果if的条件状语从句遇到变换间接和直接时 , 祈使句应用not to....如; She said not to close the window常见的时间状语从句的连词有：as soon as,when,while ,as,until等9．—Tom, do you know if Sam _______ to my party next week?—I think he will come if he __________.A．comes; will invite B．will come; will be invitedC．comes; invites D．will come; is invited【答案】D【解析】解析：句意：——汤姆，你知道山姆下个星期会来参加我的聚会吗？——我认为如果他被邀请了他会来的。
第一句中的if翻译为“是否”，引导宾语从句；根据句意，可知从句的时态应该用一般将来时；第二句中的if翻译为“如果”，引导条件状语从句，在if引导的条件状语从句中，要用一般现在时代替一般将来时，由句意可知用被动语态，故选D。
10．_____there was no obvious evidence, most people didn’t think he was guilty of the robbery. A．When B．While C．Since D．As【答案】C【解析】【详解】句意“由于没有明显的证据，大多数人认为他没有犯抢劫罪”。
A.当……时候（引导时间状语从句）；B.当……时候（引导时间状语从句）；C.since“因为”、“既然”，侧重主句，从句表示显然的或已为人所知的理由，语气比because稍弱；D. as因为，表示的“原因”是双方已知的事实或显而易见的原因，或者理由不是很重要。
根据句意可知，因为没有明显的证据，且这个理由很重要，所以人们认为他没有犯抢劫罪，故选C11．– I usually choose to take the train to travel __________ I'm free.-So do I. I think we can enjoy something beautiful on the trainA． before B．when C． after D． though【答案】B【解析】【详解】句意：--当我有空的时候，我通常选择乘火车去旅行。
--我也是。
我认为在火车上我们可以欣赏一些美丽的景色。
A. before在…之前；B. when当…时候；C. after在…之后；D. though 尽管。
根据题意，故选B。
12．— Do you think Jack will catch up with us?— I believe so._______ he loses himself in computer games.A．If B．Unless C．Or D．But【答案】B【解析】【详解】句意：—你认为杰克会赶上我们吗? —我认为会，除非他沉迷于电脑游戏。
A. If如果；B. Unless除非；C. Or否则；D. But但是。
根据本题语境，可知，回答为如果他不沉迷于电脑游戏，他就能赶上我们，如果不，即为除非。
故选B。
13．If you don’t go to the meeting tomorrow, ________ ?A．he will, too B．he won’t, either C．he does, too D．he doesn’t either 【答案】B【解析】【详解】句意：如果明天你不去开会，他也不去。
考查时态。
If引导时间状语从句，遵循“主将从现”原则，从句是一般现在时，所以主句要用将来时，排除C和D，too意为“也”，用于肯定句句末，either意为“也”，用于否定句句末，排除A，故答案选B。
14．Tony has had to cook by himself ________ his mother went on business to Guangzhou. A．since B．after C．during D．when【答案】A【解析】【详解】句意：自从妈妈去广州出差以来，托尼不得不自己做饭。
A. since从……以来；B. after在……之后；C. during 在……期间；D. when当……时候。
since后跟时间状语从句时，表示的是到目前为止的时间段，从句时态为一般过去时，而主句的时态为现在完成时，故正确答案为A。
15．It is impossible for ________ little children to do ________ much work in ________ a short time.A．so; so; such B．such; so ; such C．so; such ; such D．such; such ; so 【答案】B【解析】试题分析：句意：为如此小的孩子在如此短的时间做那么多工作是不可能的。
so （adv.）表示“如此”、“这样”的意思。
用作副词，修饰形容词和副词。
主要结构有：1.so +adj.+a/an +可数名词单数+that从句；2.so+adj./adv.+that从句；3.so+many/few/much/little+复数可数名词+that从句such（adj.）表示“如此”“这样”的意思。
