They all looked so happy. They______have suc
单项选择题 【2018年真题】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。
查看试题解析 进入题库练习
