A.Must; must | B.Can; must | C.Must; must have | D.Can; must have |
A.can | B.shall | C.must | D.Should |
A.should be | B.may be | C.must | D.can be |
A.may have | B.needn’t have | C.wouldn’t have | D.must have |
A.may | B.might | C.could | D.Must |
A.could | B.used to | C.would | D.Might |
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