A.Will | B.Should | C.Would | D.Could |
A.must have been | B.might be |
C.could be | D.might have been |
A.might | B.must | C.will | D.should |
A.will | B.would | C.should | D.Could |
A.must; will | B.shall; must |
C.should; am due to | D.shall; am bound to |
A.can | B.could | C.should | D.Would |
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