100.You ____　 the book to me．You can keep it if you like．

　 A．can't return 　　B．needn't have returned　 C．may not return 　　D．can't have returned

巩固练习答案：

1－5 ADBAA　 　6－10 A DABD　 　　11~15 BACBC　　 16~20 ADAAC　　　 21~25 ACBBB

26~30 ABBCC　 　　31~35 DDBAB　　　 36－40 CBCDB　 　41－45 DACBD　 　46--50　 DCBBB　

51-- 55 CDAAB　　 56--60 BBCBA　　　 61--65 DCAAA　 　66--70 DDDCB　 　　71--75　 BDCDD　　

76--80 CABCD　　 81--85BCCCC　　　 86--90BADBA　　 91--95 CBBBB　　 96--100 CBACB

99.I don't know what's the m atter．The train____here an hour ago．

　 A．shall arrive 　　　B．should arrive　　　 C．should have arrived 　D．ought have arrived

98.I can't find my umbrella．I ____it at the office．

　 A．could have left 　　B．can leave　　　　　 C．should have left 　　D．shall have

97.Li Ming ____ to visit his maths teacher last night．(but I am not sure)

　 A．must have gone 　B．might have gone　　 C．might go　 　　　　D．may go

96.I didn't hear the phone．I ____　 asleep．

　 A．must be　 　　　　B．should be 　　　　　C．must have been 　　D．should have been

95. Sorry, I am late again. I ____ have taken a taxi to come here.

　 A. need　　　　　　　　 　 B. should　　　　　　　 　　 C. will　　　　　　 　 D.must

94. ---Shall I tell Li Ming about it?　 ---No, you _____, he has known-about it already.

　 A. oughtn't to　　　　　 　　　 B. needn't　　　　　 　 C. shouldn't　　　　 　　 D. mustn't

93. ---I hear you've got a set of valuable Australian coins. ____ I have a look?　　　 ---Yes, certainly.

　 A. Do　　　　　　　　　 　　　　　 B. May　　　　　　 　　　　　 C. Shall　　　　　　　　 D. Should

92. Sir, you ____ be sitting in this seat. It is for women or childen only.

　 A. can't　　　　　　　　 　 B. oughtn't to　　　　　 C. won't　　　　　　　　 D. needn't