单项选择题

You ______ for the exam yesterday, but you went to the cinema instead.

A.should have studied
B.must have studied
C.must be studying
D.might be studying

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单项选择题

I was really anxious about you. You ______ home without a word.

A.mustn’t leave
B.shouldn’t have left
C.couldn’t have left
D.needn’t leave

单项选择题

If it rains, we should not go out, but the sky ______ perfectly clear.

A.is
B.will be
C.was
D.had been

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