The pressure _____ causes Americans to be energetic, but it also puts them under a constant emotional strain (过度紧张).
A.to compete | B.competing |
C.to be competed | D.having competed |
You must be a writer, _____?
A.mustn’t you | B.are you | C.must you | D.aren’t you |
She’s already two hours late. What ______ to her?
A.can have happened | B.may have happened |
C.should have happened | D.must happen |
— Will your brother stay home tonight?
— I’m not quite sure. He _____ to the cinema tonight.
A.must go | B.can go | C.may go | D.may be going |
Since the road is wet this morning, _____ last night.
A.it must rain | B.it must be raining | C.it must have rained | D.it must have been rain |
— Where is John? — He _____ in the library.
A.should be | B.must be | C.can be | D.must have been |