ncers d. The singer and dancer
30. 30. The Smiths ______ their breakfast when the morning post came.
a. had b. has been having c. are having d. were having
31. 31. No one except two students ______ the meeting.
a. has been late for b. have been late for c. was late for d. were later for
32. 32. All but him and me ______ to the exhibition.
a. am going b. is going c. are going d. was going
33. 33. Interest, as well as prospects, ______ important when one looks for a job.
a. are b. were c. is d. was
34. 34. The president, accompanied by his assistants, ______.
a. have arrived b. are arriving c. had arrived d. has arrived
35. 35. A number of cars ______ in front of the park
a. is parked b. was parked c. are parked d. has parked
36. 36. the number of articles published on smoking ______ amazing.
a. is b. are c. were d. have been
37. 37. The majority of doctors ______ smoking is harmful to health.
a. are believed b. had believed c. has believed d. believe
38. 38. The majority of the damage ______ easy to repair.
a. is b. are c. were d. be
39. 39. Four-fifths of the crop ______.
a. are ruined b. was ruined c. were ruined d. have been ruined
40. 40. Three-fourths of the buildings ______.
a. was destroyed b. is destroyed c. were destroyed d. has been destroyed
41. 41. Early to bed and early to rise ______ a man healthy, happy and wise.
a. making b. to make c. make d. makes
42. 42. Mathematics ______ the language of science.
a. is b. has been c. are d. have been
43. 43. The young ______ the vital forces in our society.
a. is b. has been c. are d. have been
44. 44. Every man, woman and child ______ some history, enough at least, to survive in the world.
a. knows b. know c. is known d. are known
45. 45. None of them ______ my friends.
a. is b. are c. was d. has been
46. 46. Not only the whole nation, but the whole Europe , indeed the whole human society ______ to alter its attitude to racial problems.
a. need b. needs c. has a need d. have a need
47. 47. Getting to other planets or to the moon _____ many problems.
a. involve b. involves c. involving d. to involve
48. 48. In that country, the rich ______ richer, the poor, poorer.
a. become b. has become c. becomes d. is becoming
49. 49. The project requires more labor than ______ because it is extremely difficult.
a. has been put in b. have been put in c. being put in d. to be put in
50. 50. Not one in one hundred children exposed to the disease ______ likely to develop it.
a. should be b. must be c. is d. are

第十六章　　虚拟语气

16. 虚拟语气
1）虚拟语气用来表示说话人的主观愿望或假想，所说的是一个条件，不一定是事实，或与事实相反。虚拟语气在条件句中应用比较多。
2）条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表示的是假设的或实际可能性不大的情况，故采用虚拟语气。
　
16.1 真实条件句用于陈述语气，假设的情况有可能发生。各种结构参见下表：
句型 条件从句 主句
一般现在时 shall/will + 动词原形
祈使句
情态动词一般现在时
例如：If he comes, he will bring his violin. 如果他来，会带小提琴来的。
　 典型例题
　 The volleyball match will be put off if it ___.　□□網□文□檔□下□載□與□在□線□閱□讀□
A.　will rain　 B. rains　 C. rained　 D. is rained
　 答案B。真实条件句主句为将来时，从句用一般现在时。
注意：
1）在真实条件句中，主句不能用be going to表示将来，该用shall, will.
　 （错） If you leave now, you are never going to regret it.
　 （对） If you leave now, you will never regret it.
2）表示真理时，主句谓语动词不用shall （will） +动词原形，而直接用一般现在时的动词形式。

16.2 非真实条件句
1）虚拟语气可以表示过去，现在和将来的情况，时态的基本特点是时态往后推移。
a. 与现在事实相反的假设
条件从句 主句
一般过去时（be用were） should（would）等 +动词原形
例如：If they were here, they would help you. 如果他们在这儿，会帮助你的。
含义：They are not here, they can’t help you.
b. 与过去事实相反的假设
条件从句 主句
过去完成时 should（would）等+ have+ 过去分词
例如：If he had come yesterday, I should / would have told him about it.如果他昨天来的话，我会把这件事告诉他的。
　 　 含义：He did not come yesterday, so I did not tell him about it.
c. 表示对将来不大可能发生的事情的假想
条件从句 主句
一般过去时 should/would等 +