A.could | B.would | C.should | D.might |
A.must | B.may | C.can | D.should |
A.should do | B.must do | C.should have done | D.must have done |
A.might | B.must | C.could | D.ought to |
A.would have done | B.could have done |
C.must have done | D.should have done |
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