He won the scholarship. He______hard these terms.A、should have workedB、must hav

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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，接现在时表示对现在的肯定推测；接完成时则表示对过去情况的肯定推测。同样，接现在完成进行时，则表示对一直以来情况的推测。根据题意，是说他这些学期以来一定一直都很努力学习，所以选C。

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