1 . —Did you paint your house yourself? It looks good.
—I_______have done all the painting. I asked my brother to help me.

A．couldn’t

B．mustn’t

C．needn’t

D．shouldn’t

2 . He ______ writing the paper now. He hadn’t written a single word when I left him ten minutes ago.

A．shouldn’t be	B．can’t have finished
C．can’t be	D．mustn’t have finished

3 . From her knowledge of Douglas's habits，she feels sure that the attacker last night ___________Douglas.

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

4 . 一I think I saw Mr. Smith at yesterday's party.
一He ______ there. He is now on a business trip in Greece. And he left the day before yesterday.

A．mustn't have been	B．couldn't have been
C．might not be	D．should not be

5 . We ________ such great achievements without your efforts. Thanks a lot.

A．can’t have made	B．couldn’t have made
C．were unable to make	D．are unable to make

6 . —Did you hear that Jack used to be a policeman for two years?
—You’re kidding! He ______, for he’s too short.

A．can’t be	B．can’t have been
C．may not be	D．may not have been

7 . —What did you say to your sister? I saw her crying in the room.
— It _________ my fault. I just said hello to her when I met her, nothing else.

A．must have been	B．can’t have been
C．oughtn’t to be	D．should have been

8 . ----Have you heard of Wang Meng?
----Yeah. She ______ have done better. She won China’s first gold medal at Turin.

A．should

B．might

C．needn’t

D．couldn’t