2. 外语
  3. Mary’s score on the test is the highest in her class; she ______ have studied very hard.

Mary’s score on the test is the highest in her class; she ______ have studied very hard.

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问题 Mary’s score on the test is the highest in her class; she ______ have studied very hard.
选项 A、may
B、should
C、must
D、ought to
答案C
解析 must(have done)表示对过去事实的肯定推测。根据句子前后语义“得分高”与“学习刻苦”，可以判定其为肯定的因果逻辑关系，而且后面的行为发生在前面的行为之前，故C项为正确答案。  
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本试题收录于： B类竞赛（英语专业本科专科）题库大学生英语竞赛（NECCS）分类
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B类竞赛（英语专业本科专科）

大学生英语竞赛（NECCS）

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