He won the scholarship. He ______ hard these terms.

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问题 He won the scholarship. He ______ hard these terms.

选项 A、should have worked
B、must have worked
C、must have been working
D、could have worked

答案C

解析 本题考查的是情态动词表示推测的情况。Must表示肯定推测,+现在时表示对现在的肯定推测;+完成时则表示对过去情况的肯定推测。同样,+现在完成进行时,则表示对一直以来情况的推测。根据题意,是说他一定这些学期以来一直都很努力学习,所以选C。
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