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(2013·安徽安庆二模)—She looks very happy. She ________ have passed the exam.
—I  guess so. It's not difficult after all.
A.should B.must
C.could D.might
B
选B 考查情态动词。句意:“她看上去很开心。她一定是通过了考试。”“我想是吧。毕竟考试不难。”四个备选项都可以用来表示推测,must语气最强,然后是should, could, might语气最弱。根据语境,说话人推测她通过考试是有一定的理由的,即她看起来很开心,因此推测时很有把握,故用must。
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