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It might have been John bought a present for Mary yesterday.A.thatB.whenC.whatD.

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It might have been John bought a present for Mary yesterday.A.thatB.whenC.whatD.

It might have been John _____ bought a present for Mary yesterday.

A.that

B.when

C.what

D.which

试题答案

A

为强调句型,只是其中的动词be采用了might have been这一复杂结构。