Anti-Japanese Warr和谓语broke out是主动关系，不能用被动语态，所以答案为D，意思是“抗日战争爆发于1937年，持续了8年之久”。
12 ____________you____________there before?
A. Have, been B. Have, gone C. Have, been to D. Have gone to
正确答案：A 解析：本题意为“你以前去过哪儿吗？”，表明说话时双方都不在那个地方，应该用have been to结构，答案为A。
13 Tom ____________ his lessons from seven to eight last night. A. was doing B. had done C. were taken D. had been taken 正确答案：A
解析：时间状语from seven to eight last night表示的是一段时间，所以应该用过去进行时，意思是“汤姆昨晚从7点到8点这段时间正在学习功课”，所以答案为A。
15 I ____________my homework now.
A. finish B. finished C. have finished D. had finished
正确答案：C
解析：此句用现在完成时表示某一动作对现在造成的影响或结果，意思是“我现在已经完成了作业”，所以应该选C。
Unit4
1 That factory ____________ nearly 50 years ago.
A. has been built B. had built C. was built D. has built
正确答案：C
答案讲解：根据时间状语nearly 50 years ago，可知谓语动词应该用一般过去时；而主语the factory和谓语build之间是被动关系，所以答案为C。句子的意思是：“这个工厂修建于50年前。”
4 Don't worry. Everything will____________in time. A. be finished B. finish C. finished D. be finishing
正确答案：A
答案讲解：主语everything和谓语动词finish之间是被动关系。在将来时态中，被动语态形式为“主语+will be + V.p.p.”，所以答案为A。句子的意思是：“不要担心，每件事都会按时完成。”
5 Such problems ____________ as soon as possible.
A. have solved B. have been solving C. have to solve D. have to be solved 正确答案：D
答案讲解：分析句子结构，主语such problems和谓语solve之间是被动关系，所以答案应选D。“主语+ have to + be +V.p.p.”的意思是“不得不被??”。句子的意思是：“这样的问题不得不尽快解决。”
6 Her application for the position ____________ by the boss. A. was refused B. was refusing C. refused D. is refusing 正确答案：A
答案讲解：分析句子结构，主语her application for the position和谓语refuse之间是被动关系，所以答案应选A。句子的意思是：“她申请那个职位被老板拒绝了。”
7 The event ____________ at the time last year.
A. happens B. happened C. is happened D. was happened
正确答案：B
答案讲解：动词happen是不及物动词，没有被动语态；时间状语at the time last year表明这件事发生在过去，应该用一般过去时，所以答案为B。句子的意思是：“这件事发生在去年的这个时候。”
8 Much ____________ in the past few years.
A. has done B. did C. has been done D. was done 正确答案：C
答案讲解：主语much和动词do之间是被动关系，时间状语in the past few years是现在完成时的一个标志，所以正确答案是C。句子的意思是：“在过去的几年中完成了很多事情。”
9 Because of the rainy day, the match ____________
A. has been putting off B. has put off C. put off D. has been put off 正确答案：D
答案讲解：主语the match和谓语put off之间是被动关系，应用被动语态，所以答案为D。句子的意思是：“由于下雨，比赛被推迟了。”
10 Working hours in the United States ____________over the past 20 years. A. have increased B. increased C. were increasing D. have been increased
正确答案：A
答案讲解：increase在句中表示一种状态而不是动作，所以不能用被动语态；根据时间状语over the past 20 years，可知本句应用现在完成时，表示过去发生的事情对现在的影响，所以答案为A。句子的意思是：“在美国过去的20年中，工作时间增加了。”
13 The steps of progress in society ____________ of as having happened in a short time. A. must not think B. must not be thought C. must think D. thought 正确答案：B
答案讲解：主语the steps of progress in society和谓语think of之间是被动关系，应用被动语态，所以应选B。句子的意思是“不应该认为社会进步的步伐会在短时间内发生。”
15 Owing to the snowstorm, the trip to the mountain ____________.
A. has been canceling B. has canceled C. canceled D. has been canceled 正确答案：D
答案讲解：the trip to the mountain和cancel 之间是动宾关系，所以这里应该用被动语态，用be+V.p.p.的形式，这里符合要求的只有D，因此正确答案应该是D。
Unit5
3 Helen had to shout____________above the sound of the music.
A. making herself hear B. to make herself hear C. making herself heard D. to make herself heard
正确答案：D
解析：本句需要动词不定式来做动词shout的目的状语，所以应在B和D之间选择。而“让自己被别人听到”应该用heard，而不是hear，所以应该选D。整句话的意思是：海伦不得不大声喊，以使别人能在音乐声中听到她的声音。
7 The teacher asked us ____________ so much noise. A .don't make B. not make C. not making D. not to make
正确答案：D 解析：本句需要动词不定式来做ask的直接宾语，并根据句意判断，应该用不定式的否定式，所以应选D。整句话的意思是：老师让我们不要这么吵。
9 I'd rather have a room of my own, however small it is, than____________a room with someone else. A. to share B. to have shared C. share D. sharing 正确答案：C
解析：本句用的是would rather do sth. than do sth.句型，than后面的动词不定式一般省去不定式符号to，所以应选C。整句话的意思是：我宁愿要一间属于自己的屋子，多小都行，也不愿和别人同住一个房间。
14 I am sorry____________ written you a letter at the time. A. to have not B. to not have C. not to have D. not having 正确答案：C
解析：本句需要动词不定式来做原因状语，表示过去没有做到的事情，应该用不定式的否定式，所以应选C。整句话的意思是：我很抱歉当时没有写信给你。
16 He could do nothing but_______for the bus_______.
A.wait...to come B.wait....come C.waiting...coming D.waited.....came 正确答案：A
19 I remember____him_____the bike needed_______.
A.hearing....saying...to repair B.to hear.....say....to repair
C.hearing...say...repairing D.to haer...saying...to be repaired 正确答案：C
35 We are not allowed______outdoors with some other children A.playing B.to be playing C.to play D.be playing 正确答案：C
41 The problem is____diffcult for us______.
A.so....work out B.very too....to be wprked out C.rather too...to work out D.quite too...to work it out 正确答案：C
49_____that evening was due to his ill health.
A.He failed to come B.That he failed to coming C.His failure to come D.His failure in coming 正确答案：C
50 I would love____to the party last but I had to work extra hours to finish a report A.to go B.to have gone C.going D.having gone 正确答案：B
Unit6
1 Mark often attempts to escape ____________ whenever he breaks traffic regulations. A. having been fined B. to have been fined C. to be fined D. being fined
正确答案：D
解析：本句中动词escape需要动名词来做宾语，并根据句意要用被动语态，所以应选D。整句话的意思是：马克无论什么时候违反了交通规则，他经常试图逃避罚款。
2 My wife said in her letter that she would appreciate ____________ from you sometime. A. to have heard B. to hear C. for hearing D. hearing
正确答案：D
解析：本句中动词appreciate需要动名词来做宾语，所以应选D。整句话的意思是：我的妻子在信中说，她很希望能适时收到你的来信。
3 The thief took away the woman's wallet without____________. A. being seen B. seeing C. him seeing D. seeing him 正确答案：A
解析：本句中介词without需要动名词来做宾语，并根据句意要用被动语态，所以应选A。整句话的意思是：那个小偷在没被发现的情况下偷走了那位女士的钱包。
4 People appreciate____________ with him because he has a good sense of humor. A. to work B. to have worked C. working D. have working 正确答案：C
解析：本句中动词appreciate需要动名词来做宾语，所以应选C。整句话的意思是：人们都喜欢和他一起工作，因为他很有幽默感。
5 I've enjoyed____________ to talk with you.
A. to be able B. being able C. to been able D. of being able 正确答案：B 解析：本句中动词enjoy需要动名词来做宾语，所以应选B。整句话的意思是：能和你谈话，我很高兴。
6 No one can avoid ____________by advertisements.
A. to be influenced B. being influenced C. influencing D. having influenced 正确答案：B
解析：本句中动词avoid需要动名词来做宾语，并根据句意要用被动语态，所以应选B。整句话的意思是：没有人能免受广告的影响。
7 They are considering ____________ before the prices go up.
A. of buying the house B. with buying the house C. buying the house D. to buy the house 正确答案：C
解析：本句中动词consider需要动名词来做宾语，应选C。整句话的意思是：他们正在考虑在房价上涨之前买房。
8 He thought that ____________.
A. the effort doing the job was not worth B. the effort was not worth in doing the job
C. it was not worth the effort doing the job D. it was not worth the effort by doing the job 正确答案：C
解析：本句练习的是it is worth (the effort) doing sth.句型，意思是“值得做??”，所以应选C。整句话的意思是：他认为不值得费力来做这项工作。
9 If I had remembered____________the door, the things would not have been stolen. A. to lock B. locking C. to have locked D. having locked 正确答案：A
解析：本句练习的是动词remember的用法，remember的搭配有两种：remember to do sth.（记得要去做什么可还没有做）和remember doing sth.（记得已经做了什么）。根据句意，应该用to do sth.来做宾语，所以应选A。整句话的意思是：要是我当时记得锁门的话，东西就不会被盗了。
10 Your shirt needs____________ . You'd better have it done today. A. iron B. to iron C. ironing D. being ironed 正确答案：C
解析：本句中动词need需要动名词来做宾语，并用主动表示被动，所以应选C。意思是：你的衬衫该熨了。你最好今天就熨。
Unit7
1 You aren't using this typewriter, ____________ ? A. are you B. do you C. will you D. have you 正确答案：A
解析：根据反意疑问句构成的基本原则，如果前一部分为否定形式，那么后一部分就用肯定形式，而且两部分的时态要一致，所以应选A。整句话的意思是：你不用这台打字机了，是吗？
2 You should go to the grand opening ceremony, ____________ ?