-Did they have a good time at the party?-Judging by their smiles, they _________ have enjoyed themselves.A.mightB.mustC.couldD.would
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B解析考查情态动词用法。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。