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 |
A.might | B.must | C.would | D.can |
A.mightn’t | B.won’t | C.need’t | D.mustn’t |
A.ought | B.must | C.should to | D.ought to |
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