1 . She ________the film, for she knows nothing about it.

A．can’t see

B．can’t have seen

C．must see

D．mustn’t have seen

2 . ---Is there any flight to New York?
--- I think there ______ be, for it is snowing so heavily.

A．shouldn’t

B．mustn’t

C．can’t

D．needn’t

3 . Despite the fact that Lucy is a lovely girl, she _____ be extremely difficult to work with sometimes.

A．must

B．should

C．would

D．can