1. As usual, he put on a show as though his trip______ a great success.

　　A. had been B. has been C. were D. was

　　解析：A.as though引導的與過去相反的虛擬。

　　2. Looking round the town, he felt as though he ______ away for ages.

　　A. has been B. was C. is D. had been

　　解析：D.felt是過去式，所以該句是由as though引導的與過去相反的虛擬。

　　3. John is so strongly built that he looks as if he ______ as elephant.

　　A. lifts B. is lifting C. lifted D. could lift

　　解析：D.as if引導的與現在事實相反的虛擬。

　　4. He described the town as if he ______ it himself.

　　A. had seen B. has seen C. saw D. sees

　　解析：A.as if引導的與過去相反的虛擬。

　　5. Most insurance agents would rather you______ anything about collecting claims until they investigate the situation.

　　A. do B. don’t C. didn’t D. didn’t do

　　解析：(D)would rather后接從句要求用虛擬語氣，形式為過去式，表示對現在或將來的假設，或為過去完成式表示對過去的情況的假設。6. Although most adopted persons want the right to know who their natural parents are, some who have found them wish that they ______ the experience of meeting.

　　A. hadn’t B. didn’t have had C. hadn’t had D. hadn’t have

　　解析：(C)who引導的定語從句中的現在完成時表示動作業已發生，所以主句中表示的虛擬是針對已經發生了的行為，所以應該用過去完成式表示對過去的虛擬。

　　7. Without electronic computers, much of today’s advanced technology ______ .

　　A. will not have been achieved B. have not been achieved

　　C. would not have been achieved D. had not been achieved

　　解析：(C)這是一人含蓄虛擬條件句，通過介詞短語without,表示潛在的一種假設，而主句中的情況也早已經發生，所以是對過去情況的一種假設，因此用would not have been achieved這一形式。

　　8. He told her to return the book in time so that others ______ a chance to read it .

　　A. may have B. will have C. would have D. might have

　　解析：(D)連so that引導的從句中要求用虛擬語氣，表示一種假設，形式為might+動詞原形。

　　9. It is time that the government ______ measures to protect the rare birds and animals.

　　A. takes B. took C. has taken D. taking

　　解析：(B)It is time that是一種要求從句用虛擬語氣的常見句型。虛擬語氣形式為動詞的過去式。

　　10. He was very busy yesterday, otherwise he ______ to the meeting.

　　A. would come B. came C. would have come D. had come

　　解析：(C)otherwise用來表示一種含蓄的虛擬假設，因為是對過去(yesterday)的情況的假設，所以應該用would have come形式。

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