Jim’s score on the test is the highest; he ______hard.

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问题 Jim’s score on the test is the highest; he ______hard.

选项 A、should have studied
B、could have studied
C、must have studied
D、could study

答案C

解析情态动词题。must have done表示对过去情况肯定的推测，意为“一定／肯定做过某事”；should have done表示“过去本应该做某事”，但事实上未做；could have done表示过去能做某事而实际上没做，含有遗憾之意，根据题意应选[C]。

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专业英语四级

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