A.could | B.should | C.need | D.would |
A.Shall | B.Would | C.Can | D.Might |
A.can’t | B.mustn’t | C.needn’t | D.shouldn’t |
A.must | B.can | C.should | D.may |
A.need have done | B.must haven done |
C.should have done | D.could have worked |
A.should keep | B.was kept | C.would be kept | D.be kept |
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