They all looked so happy. They______have succeeded after so many failures.-焚题库

They all looked so hap

单选题 They all looked so happy. They______have succeeded after so many failures.

A.must

B.would

C.should

D.could

正确答案： A

答案解析: 本题考查情态动词辩析?句意：他们定成功了。 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，本题本题选A。

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