1 . She   ________   have attended that meeting, for she was doing paperwork in the office then. (用适当的情态动词填空)

2 . —A man answered the phone. I suppose it was her husband.
—It ______ her husband. He has been dead for ages.

A．mustn’t be

B．couldn’t have been

C．may not have been

D．mustn’t have been

4 . — Where_____Mary have put the empty bottles?
—She _____them away.They must be somewhere.

A．can;mustn't have thrown

B．must;needn't have thrown

C．could;couldn't have thrown

D．should;might not have thrown

5 . The boss ______ the worker how to do it, or the accident couldn’t have happened.

A．can’t have told

B．ought to tell

C．could have told

D．mustn’t have told

6 . The room is in a terrible mess; it ____cleaned.

A．can’t have been	B．shouldn’t have been
C．mustn’t have been	D．wouldn’t have been

7 . Mr. Black ________ home because his briefcase is still on the desk.

A．mustn’t have gone	B．can’t have gone
C．shouldn’t have gone	D．needn’t have gone

8 . It rained a lot during their journey, so they________have had a good time.

A．can’t

B．must

C．shouldn’t

D．might

9 . He___ have attended the meeting this morning. He has been staying at my home for a whole day.

A．can’t

B．mustn’t

C．shouldn’t

D．needn’t

10 . You _____ her in her office last Friday, she’s been out of town for two weeks.

A．needn’t have seen	B．must have seen
C．might have seen	D．can’t have seen