A.can have used | B.need have used | C.must have used | D.could have used |
A.stayed | B.had stayed | C.would stay | D.were staying |
A.should | B.could | C.dare | D.did |
A.will | B.might | C.must | D.would |
A.can | B.might | C.could | D.must |
A.Had I known | B.Should I know |
C.If I know | D.If I knew |
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