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 吉姆的考试分数最高,他学习肯定很努力。情态动词题。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;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”。根据句意可知应选C。
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