A.needn’t | B.couldn’t | C.shouldn’t | D.mustn’t |
A.must | B.should | C.might | D.shall |
A.mustn’t have stayed | B.shouldn’t have stayed |
C.mustn’t stay | D.ought not to stay. |
A.must be; may be | B.should be; can be |
C.may be; must be | D.can be; should |
A.must be | B.must have been | C.should be | D.should have been |
A.could have caught | B.should have caught |
C.must catch | D.would have caught |
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