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

A．can’t

B．must

C．shouldn’t

D．might

2 . —I expected him to be nervous before his speech, but he was as cool as a cucumber.
—He _______ it carefully.

A．could have prepared	B．shouldn’t have prepared
C．must have prepared	D．can’t have prepared

3 . 28．You ______ very fast if you went from New York to Boston in six hours．

A．should drive	B．would have driven
C．may drive	D．must have driven