A.must | B.could | C.should | D.will |
A.walk | B.have walked | C.have been walking | D.will be walking |
A.may | B.must | C.can | D.Should |
A.don’t have to | B.oughtn’t to | C.won’t | D.mustn’t |
A.could stay | B.would stay | C.could have stayed | D.had stayed |
A.must have fallen asleep | B.must fall asleep | C.can’t been asleep | D.must be asleep |
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