2. 外语
  3. Jim’s score on the test is the highest; he ______ hard.

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 must have done表示对过去情况的肯定推测，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。根据句意可知应选C项。
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