状语从句专项练习（附答案）
高中英语高考复习状语从句专项练习(附参考答案)
高考英语状语从句专项练习班级考号姓名总分一、单句语法填空1._______ we don’t stop climate change, many animals and plants in the world will be gone.2. Let’s not pick these peaches until this weekend so _______ they get sweet enough to be eaten.3._______ you can sleep well, you will lose the ability to focus, plan and stay motivated after one or two nights.4.If you don’t understand something, you may research, study, and talk to other people _______ you figure it out.5.Pahlsson screamed ________ loudly that her daughter came running from the house.6.My grandfather still plays tennis now and then, __________ he’s in his nineties.7. ___________ small, the company has about 1，000 buyers in over 30 countries.8.______some people are motivated by a need for success, others are motivated by a fear of failure.9.I am not afraid of tomorrow, _________ I have seen yesterday and I love today.10.I really enjoy listening to music _______ it helps me relax and takes my mind away from other cares of the day.11. ______ the average age of the population increases, there are more and more old people to care for.12.______ the damage is done, it will take many years for the farmland to recover.13.______ the students came from different countries, they got along quite well in the summer camp.14.There is only one more day to go ______ your favorite music group play live.15.If you miss this chance, it may be years ______ you get another one.16.It is so cold that you can’t go outside ______ fully covered in thick clothes.17.I don’t really like the author, ______ I have to admit his books are very exciting.18.The young couple, who returned my lost wallet, left _______ I could ask for their names.19.“You can’t judge a book by its cover，” ____the old saying goes.20.One can always manage to do more things，no matter ________ full one’s schedule is in life.21.I have heard lot of good things about you _____ I came back from abroad.22.It’s much easier to make friends ________ you have similar interests.23.I had hardly got to the office ________ my wife phoned me to go back home at once.24.I was about to go to the office ________ my boss phoned me.25.I was watching TV _______ my boss phoned me.26.Hot _____ the night air was, we slept deeply because we were so tired after the long journey.27.If a lot of people say a film is not good, I won’t bother to see it, or I’ll wait ________ it comes out on DVD.28.He earned so little money ________ he couldn’t support his family.二、单句改错（请将句子逻辑搞清楚，再进行改错练习）1.Video games can be a poor influence if leaving in the wrong hands.2.Whatever I have to give a speech, I get extremely nervous before I start.3.You won’t find paper c utting difficult as long you keep practicing it.4.Though not very big, but the restaurant is popular in our area.5.Although we allow tomato plants to grow in the same place year after year, but we have never had any disease or insect attack problems.6.In fact, I don’t like to go anymore, so I’m afraid I’ll lose their friendship.7.If I was only a child when I studied in that classroom, I will never forget it.8.There the air is clean or the mountains are green.9.If you notice that when someone is missing and hurt, tell your teacher immediately.10.Both Dad or I planned to do something on Mother’s Day.11.My only mistake was that I dropped some on the floor after I was packing them up.12.If we stay at home, it is comfortable but there is no need to spend money.13.No sooner had Mo Yan stepped on the stage when the audience broke intothunderous applause.14.You will never gain success if you are fully devoted to your work.15.Mike is so an honest worker that we all believe in him.16.I was about to go shopping while my mum called me.17.I was listening to music while Li Hua called me.18.You are tall but I am short.附：参考答案一、单句语法填空1.If2.that3.Unless4.until/till5.so6.though/while/although7.Though/Although/While8.While9.because/as/for10.because/as/since11.As/When12.Once/If13.Although/Though/While14.before 15.before16.unless17.but18.before19.as20.how21.since22.when/if23.when24.when25.when26.as/though27.until/till28.that二、单句改错1.leaving---left2.Whatever---Whenever3.as long/\ as4.删掉but5.删掉but6.so---but7.If---Although/While/Though8.or---and10.删掉when; and---or 10.or---and11.after---when12.but---and13.when---than14.if---unless15.so---such16.while---when17.while---when18.but---while。
(完整版)英语状语从句专题(练习题含答案)
一、选择题1．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 2．Don't be afraid of asking for help ________ it is needed.A．unless B．until C．although D．when3．You will be out of date ________ you keep on studying from time to time.A．unless B．although C．if D．otherwise 4．—My parents gave red packets to my sister every Spring Festival ________ she got a job. —That’s because your sister was able to make money by that time.A．after B．when C．since D．until5．My grandma enjoys sharing videos on Douyin like the young ________ she is over seventy. A．since B．if C．though D．unless 6．Sam thought his robot broken ________ Jim pointed out that he’d forgotte n to turn it off. A．until B．unless C．after D．as soon as 7．—Do you like the Chinese cartoon Boonie Bears: Blast into the Past?—Sure. It is ________ interesting film ________ my son wants to see it again.A．so; that B．such a; that C．so an; that D．such an; that 8．— Jenny, will you leave for the UK now?— No. It will be two weeks ________ I leave here.A．until B．since C．before D．when9．—It is a pity that the disease is still terrible at present.—Yes. It will be worse ________ we take further action to do something for it.A．unless B．since C．if D．when 10．You’ll ________ the war ________ you watch the film.A．feel sad about; unless B．feel sad about; ifC．feel sad with; unless D．feel sad with; if11．—When will the railway that connects the two cities open?— next year. Only two thirds been built.A．Until; has B．Until; haveC．Not until; has D．Not until; have12．At present,it is not easy for some students to get up early ________ they have too much homework to finish.A．unless B．since C．as a result D．although 13．—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．Unless 14．The astronaut lives in ________ that he has to be careful with every movement.A．such little space B．so little space C．so much space D．such more space 15．All students should keep taking exercise every day _______ they are busy studying so many subjects.A．until B．because C．though D．unless16．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 that17．— Do you often take exercise in the morning every day?— Yes. I go jogging every morning_______there is heavy air pollution.A．until B．unless C．if D．as18．The kitchen in my flat is well designed it is a bit small.A．although B．since C．so D．because 19．—_______ 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 20．It’s almost three years ________we saw each other last time.A．since B．after C．when D．before21．you are very busy, I won’t go to Xuzhou Amusement Land with you.A．Unless B．Whether C．Until D．Since22．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．until23．You will get a toothache _____________ you clean your teeth regularly.A．unless B．when C．though D．because 24．Plenty of ideas were considered________the artist decided on the design of the sculpture. A．before B．so C．unless D．because 25．There will be fewer accidents _______ all of us obey the traffic rule.A．if B．unless C．though D．because26．________ it has a long history, time hasn’t stopped the Forbidden City from trying to build bridges with young people through cultural products.A．Unless B．Because C．Although D．Since27．Jack is still working to high standards ________ he has made great achievements. A．until B．if C．though D．because28．________ she couldn’t see his face, she could tell by his voice that he was young. A．Unless B．If C．Though D．Because 29．—Look! Someone is running the red lights.—We should wait ________ others are breaking the rules.A．although B．because C．unless D．if30．Jack has made great progress ________ he joined the English club.A．when B．since C．while D．before31．—We will go out for a picnic as we planned ________ it rains tomorrow.—You needn’t worry about the weather. It’s sunny tomorrow.A．until B．unless C．if D．when 32．Everyone makes mistakes, and no one will make progress ________ he is willing to learn from them.A．unless B．if C．though D．but33．— 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; mainly34．—Too much homework has made me tired these days, Miss Wang.—Tha t’s true. But a small tree won’t grow into a big tree ________ it experiences lots of winds and rains.A．if B．while C．when D．unless35．—Did you watch the Football League yesterday?—Yes, of course. I never miss it ________ I am too busy with my homework.A．unless B．until C．if D．since36．Life is like climbing a mountain. ________ you feel tired, you will enjoy the beautiful view at the top of the mountain.A．Since B．Unless C．Because D．Though37．— Has the meeting begun?—Not yet. We have to wait ________ everyone is here.A．and B．until C．or D．but38．_______ she is wrong, it’s not a big deal.A．Because B．So C．Although D．But39．The pollution in the sea will be terrible ________ the Japanese government gives up their plan.A．until B．unless C．because D．if 40．Protecting wildlife is without doubt an important part, ________ each animal on Earth has a role to play in the ecosystem.A．since B．though C．unless D．if41．________ 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．Until 42．Suzy, you will achieve nothing ________ you devote yourself to your study.A．after B．though C．because D．unless43．Her job is not up to the boss's standard ________ she has worked at it for a week. A．since B．although C．if D．unless44．Your parents love you so much ________ they seldom say, “I love you”.A．unless B．that C．because D．although 45．You will never grow ________ you try to do something beyond your abilities.A．when B．since C．though D．unless 46．—What is our head teacher like?—Oh, he is very kind ________ he looks very serious.A．because B．though C．if D．when47．________ I have solved it, you can't imagine how much difficulty I faced.A．Because B．Although C．Unless D．When48．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．until 50．Grade 9 students should keep exercising ________ they are busy with so many subjects. A．if B．until C．though D．because【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：在古代，人们很少长途旅行，大多数农民最远的行程仅仅是到当地的市场。
英语状语从句专项训练100(附答案)
13．—Dear, I have an important meeting tomorrow.
—It doesn’t matter. If you _______ go to the movie tomorrow, I _______ my friend to go with me.
16．– Thank you for telling me so much knowledge about nature.
–Don’t mention it. ______ you have more questions, come to me any time.
A．If
B．Becauቤተ መጻሕፍቲ ባይዱe
C．Though
考点：考查动词时态。
14．—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。
4．The nurse won’t leave her patients ______ she’s sure somebody else takes good care of them.
【英语】英语状语从句题20套(带答案)含解析
【英语】英语状语从句题20套(带答案)含解析一、初中英语状语从句1．The nurse won't leave her patients________she's sure they are all taken good care of. A．unless B．because C．since D．if【答案】A【解析】句意：这个护士不会离开她的病人，除非她确定病人们都被照顾得很好。
because因为，引导原因状语从句；since自从，引导时间状语从句；既然，引导原因状语从句；if如果，引导条件状语从句；unless除非，如果不，引导条件状语从句。
根据句意可知，这里考查的是从属连词unless，故选A。
2．I have to leave now __ I can catch the last bus.A．so that B．because of C．until D．as soon as【答案】A【解析】试题分析：so that以便，所以；because of因为，由于；until直到；as soon as一……就……。
句意：为了赶上末班车，我现在必须离开了。
结合语境可知选A。
考点：连词辨析点评：连词在句子中主要起联系上下文的作用，他们之间的区别就是表示逻辑关系的不同，所以在解题时先要理解上下文含义，然后根据上下文逻辑关系选择合适的连词。
连词的用法都比较多，语义之间还有交叉，熟记其基本应用规则，了解其区别，注意固定搭配对象，是做好此类题型的关键。
3．— When did you go to bed last night?— ____________ I finished my homework.A．Until B．Not until C．When D．While【答案】B【解析】not …until 表示直到…才，与短暂性动词连用，故选B4．You'd better get home earlier today we can go out for a big meal.A．in order to B．such that C．so that D．in order【答案】C【解析】句意：你最好今天早点回家，这样我们就可以出去吃大餐了。
英语状语从句专题练习(及答案)含解析
生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。选项的位
置在 if 引导的条件状语从句中，要用一般现在时态， B C选项是将来时态不符合题意要排
除。 D 选项是现在完成时态不符合题意要排除。 Reach an agreement 达成协议固定短语搭
配。 agreement is reached 协议做主语要用被动语态，故选 A。
【点睛】
if 条件句不一般 ,几个要点记心间 ; 条件句 ,放在前 ,逗号要放句中间。
条件句表可能，主句多用将来时；
条件句表事实，主句常用现在时。
在 if 引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实及其产生的相关的
结果，主句用一般将来时态，从句用一般现在时态。如：
We can walk there if we can't find a bus. If it rains tomorrow, we will not go to the zoo.
C． won’ t; is 【答案】 B
D． isn ’ t; will be
【解析】
【详解】
句意：如果我们的政府现在不注意食品安全，我们的健康就会出于危险之中。
结合语境可知，本句主语描述的是将来某时进行的动作，故用一般将来时态。当主句描述
将来时态， if 引导的条件状语从句中用一般现在时态表示将来动作，结合语境可知选
if 条件句放
句首，从句后面要加逗号，和主句隔开。还要注意前后时态一致原则。
9．If our government A． isn ’ t; is
pay attention to the safety of food, our health B．doesn ’ t; will be
初中英语状语从句专项训练100（附答案）含解析
（英语）初中英语状语从句专项训练100(附答案)含解析一、初中英语状语从句1．They will lose the game _______ they try their best.A．unless B．once C．since D．after【答案】A【解析】【详解】试题分析：句意:他们会输掉比赛的，除非他们尽自己最大的努力。
lose the game 输掉比尽最大的努力。
A. unless 除非； B. once 一次；C. since 因为； D. after赛，try one’s best在…之后，根据题意可知此句是unless引导的条件状语从句，故选A。
2．The Italian woman didn’t feel a culture shock____it was her first time to Shanghai. A．though B．since C．if D．when【答案】A【解析】句意：这个意大利妇女没有感到一种文化冲击，尽管她是第一次来上海。
A. though尽管；B. since自从；C. if 是否，如果；D. when当---时候；根据The Italian woman didn’t feel a culture shock这个意大利妇女没有感到一种文化冲击，和it was her first time to Shanghai.她是第一次来上海之间用though 引导让步关系状语从句；故选A3．—I’m afraid the class has begun.—Don’t worry. It ________ until the bell ________. A．doesn’t begin; ring s B．won’t begin;will ringC．won’t begin; rings D．doesn’t begin; will ring【答案】C【解析】试题分析：句意：-恐怕课已经开始了。
英语状语从句题20套(带答案)
点评：连词在中考中涉及到的很多，尤其在宾语从句、状语从句、定语从句中连词是必考点。平时学习过程中，掌握连词的意思，及所表示的关系是至关重要的，这种关系的判断可以通过句子意思的理解来选择恰到的连词。
15．I'm sure dreams don't workyou do.
A．ifB．untilC．whenD．since
4．-Have you improved your spoken English？
-Not yet．I'll try my best______I am not good at it now．
A．soB．althoughC．butD．until
【答案】B
【解析】
【详解】
句意：——你提高你的英语口语了吗？——还没有．虽然我现在还不擅长，但是我会尽力的．考查连词辨析。A. so所以；B. although虽然；C. but但是；D. until直到。根据语境推测句意是——你提高你的英语口语了吗？——还没有．虽然我现在还不擅长，但是我会尽力的．在这里两个句子之间存在一个相反的让步关系，though/although/even though“虽然；尽管”，引导让步状语从句，故选B．
考点：考查连词辨析。
9．—Leonardo didn't win an Oscarhe acted inThe Revenant（荒野求生）.
一Yeah. It was hard for him to realize this dream, but he never gave up.
A．after B．since C．when D．until
---I’m afraid not. I can’t go outI finish my report.
(英语)状语从句练习题含答案及解析
（英语）状语从句练习题含答案及解析一、初中英语状语从句1．--Has the meeting begun yet？--Not yet． We have to wait everyone is here．A．and B．until C．or D．but【答案】B【解析】【详解】考查连词用法。
句意：—会议已经开始了吗？—不，还没有。
我们必须等到大家都到齐了。
and和；until直到；or或者、否则，but但是。
根据题干可知我们得等到大家都到了，这里表示直到……时候用until．故选B．2．-Have you improved your spoken English？-Not yet．I'll try my best______I am not good at it now．A．so B．although C．but D．until【答案】B【解析】【详解】句意：——你提高你的英语口语了吗？——还没有．虽然我现在还不擅长，但是我会尽力的．考查连词辨析。
A. so所以；B. although 虽然；C. but但是；D. until直到。
根据语境推测句意是——你提高你的英语口语了吗？——还没有．虽然我现在还不擅长，但是我会尽力的．在这里两个句子之间存在一个相反的让步关系，though/although/even though“虽然；尽管”，引导让步状语从句，故选B．【点睛】本题主要考查连词的用法，连词在句子中主要起联系上下文的作用，他们之间的区别就是表示逻辑关系的不同，所以在解题时先要理解上下文含义，然后根据上下文逻辑关系选择合适的连词．前后句之间是让步关系．3．You will fall behind others ______ you work hard.A．if B．unless C．though D．since【答案】B【解析】试题分析：句意：如果你不努力学习，你会落后别人。
A.because因为；B. If如果；C. Unless如果不； D. Though虽然。
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状语从句专项练习（附答案）状语从句专项练习(附答案)一、初中英语状语从句1．Mrs. White walks a dog in the park nearby every morning it’s rainy or windy.A．since B．because C．unless D．until【答案】C【解析】试题分析：句意：如果不刮风下雨，怀特夫人就会带狗到附近的公园散步。
A.. since自从；B.. because因为；C.. unless如果不；D. .until直到……才。
结合句意，故选C考点：考查连词的用法。
2．It is necessary for children to exchange ideas with parents from time to time ________ a good parent-children relationship could be set up.A．so that B．because C．as soon as【答案】A【解析】【详解】句意“为了建立良好的亲子关系，孩子们有必要不时地与父母交流思想”。
A.目的是，为的是（引导目的状语从句）；B.因为（引导原因状语从句）；C.一……就……（引导时间状语从句）。
根据句意可知，表示“目的是为了建立良好的亲子关系”，表示目的，故选A。
3．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。
4．He made a serious mistake, but he took immediate action to change that ______ it got worse. A．until B．when C．because D．before【答案】D【解析】试题分析：句意：他犯一个严重的错误。
但他采取行动来改变它以免变得更糟。
A. Until直到；B. When当……时；C. Because因为；D. Before在……之前。
在变得更糟之前采取行动改变。
故选D。
考点：考查连词辨析。
5．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D6．Life is like climbing a mountain. ______ you feel tired, you will enjoy the beautiful view at the top of the mountain.A．Since B．Unless C．Though D．Because【答案】C【解析】【详解】句意：生活就像爬山。
虽然你感到累，但你会在山顶欣赏美丽的景色。
考查状语从句；since 自从，引导时间状语从句；unless 除非，引导条件状语从句；though 虽然，引导让步状语从句；because 因为，引导原因状语从句。
此处表示让步关系，故选C。
7．We’ll go to the farm and help the farmers with the apple-picking if it ______tomorrow. A．isn’t rain B．will be rainyC．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8．Mrs. Smith explained the problem clearly _______ all of us could understand her.A．until B．although C．so that D．as soon as【答案】C【解析】【详解】句意：Smith夫人清楚地解释了这个问题，以至于我们所有人都能明白她。
until直到…时候；although尽管，虽然；so that以至于，为的是；as soon as一…就…。
根据句意可知，空后all of us could understand her表示前面explained…clearly的目的，故用so that 引导目的状语从句，选C。
9．________ you’re invited to speak, you should remain silent at the meeting.A．Because B．After C．If D．Unless【答案】D【解析】【详解】句意：除非你被邀请发言，否则你应该在会上保持沉默。
A.因为；B.在……之后；C.如果；D.除非。
根据句意可知，此句是条件状语从句，动词invite与句子的主语you之间在逻辑上存在被动关系，此空是除非，如果不的意思，此空故填Unless，故选D。
10．______we cannot change yesterday,we can learn lessons to face tomorrow.A．Though B．As C．Since D．Unless【答案】A【解析】句意：尽管我们无法改变昨天，但是我们可以吸取教训来面对明天。
though尽管，引导了让步状语从句；as当……时候，引导时间状语从句；since因此，引导原因状语从句；unless 除非，引导条件状语从句。
结合句意，前半句表示我们无法改变昨天，后半句表示我们可以面对明天，前后是让步关系，故用连词though。
故选A。
11．You will lose the ability to pay attention, plan and stay active after one or two nights _____ you can sleep well.A．until B．when C．unless D．if【答案】C【解析】【详解】句意：除非你能睡好，否则一两个晚上之后你会失去关注、计划和保持活力的能力。
本题考查从属连词的用法。
A. until用于肯定句中，表示主句的动作一直持续到从句动作发生或状态出现时为止。
翻译为“直到…为止…”；B. when可用作从属连词，引导状语从句，表示时间时作“当…时，在…的时候”；C. unless“除非，如果不”，在意义上相当于if…not，因此在有些场合中unless与if…not可互换使用，引导条件状语从句；D. if“如果”，引导条件状语从句。
根据句意“休息好”是“关注、计划和保持活力的能力”的前提，故选C。
12．________it’s Sunday tomorrow, we have to go to school.A．Though B．Since C．As D．Because【答案】A【解析】【详解】句意：尽管明天是星期天，我们不得不还要上学。
考查从属连词。
根据后文we have to go to school我们不得不去上学。
可知前面从句应表示让步状语。
故选A。
13．___________ she couldn’t see his face, she could tell by his voice that he was young. A．Unless B．If C．Because D．Though【答案】D【解析】句意：虽然她看不见他的脸，但是她能够通过声音分辨出他很年轻。
A. Unless除非；B. If 如果；C. Because因为；D. Though尽管。
根据语境以及上下文，本题考查的是连词的用法。
结合句意可知，在这里两个句子之间存在一个相反的让步关系，though/although/even though"虽然；尽管"，引导让步状语从句，符合句意。
故答案选D。
14．You will fall behind others ______ you work hard.A．if B．unless C．though D．since【答案】B【解析】试题分析：句意：如果你不努力学习，你会落后别人。
A.because因为；B. If如果；C. Unless如果不；D. Though虽然。
结合句意，故选B考点：考查连词的用法.15．He has made great progress his mother is very pleased with him.A．so；that B．enough；to C．so；too D．such；that【答案】D【解析】【详解】句意：他已经取得了如此大的进步以至于他的妈妈对他非常满意。