A.couldn’t | B.mustn’t | C.shouldn’t | D.oughtn’t |
A.was writing | B.would write | C.had written | D.has been writing |
A.needn"t | B.shouldn"t | C.mustn"t | D.can"t |
A.ought to put it | B.might put it | C.must put it | D.may have put it |
A.mustn’t | B.shan’t | C.shouldn’t | D.needn’t |
A.could stay | B.would stay |
C.could have stayed | D.should have stayed |
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