Jim’ s score on the test is the highest; ________ hard.

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问题 Jim’ s score on the test is the highest; ________ hard.

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

答案C

解析 must have done sth.的意思是“肯定做过 (发生过) 某事”,表示有证据的、语气肯定的推测。句意:吉姆考试的分数最高,他一定很用功。
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