A.must; when | B.can; while | C.will; as | D.should; though |
A.may | B.should | C.will | D.Can |
A.could | B.shall | C.may | D.can |
A.should, can | B.may, will | C.mustn’t , may | D.can’t ,must |
A.must be playing | B.could be playing |
C.must have played | D.must have been playing |
A.mustn’t leave | B.shouldn’t have left |
C.could not have left | D.needn’t leave |
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