They all looked so happy. They_________h

题库2022-08-02 68

问题 They all looked so happy. They_________have succeeded after so many failures.A.mustB.wouldC.shouldD.could

选项 A.must
B.would
C.should
D.could

答案 A

解析本题考查情态动词辨析。句意：他们看起来都很高兴。经过这么多次的失败，他们一定成功了。must have done意为" 一定做过某事" ,表示对过去事情的肯定推测。根据句意，本题选A。

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