A.ought not to | B.can’ t | C.don’ t have to | D.mustn’ t |
A.must | B.ought to | C.might | D.could |
A.not allow | B.do not allow | C.mustn’t allow | D.couldn’t allow |
A.must have studied | B.might study | C.should have studied | D.would study |
A.can’t | B.mustn’t | C.shouldn’t | D.needn’t |
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