He is an hour late He _____ by fog Of course, that's only a possibility
A.may have been delayed B.should have been delayed C.can have been delayed D.must have been delayed正确答案A
He is an hour late He _____ by fog Of course, that's only a possibility
A.may have been delayed B.should have been delayed C.can have been delayed D.must have been delayed正确答案A