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---Did they have a good time at the party?
---Judging by their smiles, they _________ have enjoyed themselves.
A.mightB.mustC.couldD.would
B
考查情态动词用法。Might have done 也许做了某事;must have done一定做了某事;could have done本可以做却未做;would have done会做某事;句意:—在聚会上你玩的开心吗?—从他们的微笑来看,他们一定完的很开心。
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