问题
选择题
---Did they have a good time at the party?
---Judging by their smiles, they _________ have enjoyed themselves.
A．might
B．must
C．could
D．would
答案
答案：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。