1. Your math instructor would have been（A） happy to give you a makeup examination had you gone（B） and explained（C） that your parents had been（D） ill at the time. （99考研第11题）
2. You should have put the milk in the ice-box; I expect it undrinkable by now.
A）became B）had become C）has become D）becomes（B6， 1990.1- 41）
3. We have done things we ought not to have done and undone things we ought to have done.
A）leaving B）will leave C）have left D）leave（B6， 1990.1-56）
4. I a few minutes when a man in black came in.
A） had been reading B） read
C） have read D） have been reading
5. The company a rise in salary for ages， but nothing has happened yet.
A)is promised B)is promising
C)has been promising D)promised (B6，1993.6-41)
6. By the end of the year all but two people .
A)have left B)will leave
C)will be leaving D)will have left （B4， 1994.1-42）
7. The conference a full week by the time it ends.
A)must have lasted B)will have lasted
C)would last D)has lasted （B4， 1997.1-22）
8. Before the first non-stop flight made in 1949，it necessary for all planes to land for refueling.
A） would be B） has been C） had been D） would have been（B4， 1996.6-25）
9. There was a knock at the door. It was the second time someone me that evening.
A)had interrupted B)to have interrupted
C)would have interrupted D)to interrupt (B6，1990.6-45)
10. If she doesn't tell him the truth now， he'll simply keep on asking her until she .
A） does B） has done C） will do D） would do（B4， 1998.6-53）
参考答案：
1. D错,应改为were。如果你去解释说当时你父母病了,你的数学教师本来会乐意给你一次补考的机会。(your parents ____ ill at the time 中动词不应用虚拟语气,应用一般过去时。)
2. C对。你本该把牛奶放在冰箱里,我想现在这牛奶已经不能喝了。(by now 是典型的用于现在完成时的时间状语;I expect it ____undrinkable by now 不是虚拟句。)
3. C对。我们做了不该做的事,而该做的事却没有做。(第一个谓语动词是现在完成时have done， 因此第二个谓语动词应是have left。）
4. A对。我在读书,读了几分钟,突然一个穿黑衣服的人走了进来。
5. C对。公司长期以来一直在答应增加工资,但依然毫无结果。
6. D对。到年底,除了两个人,所有的人可能都走了。
7. B对。到会议结束时,会议就将开满整整一周了。
8. C对。1949年进行了首次不着陆飞行,在此之前所有的飞机为了加油都得着陆。
9. A对。有人敲门,这是今晚第二次有人打扰我了。
10. A对。如果她现在不把真相告诉他,他会不断地问她,直到她说出真相。
