2. 自考
  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 译文：玛丽的考试成绩是班里最高的，她一定学习非常努力。由句意可知表示对过去发生的事情非常肯定的推测，用must have done结构，意为“过去一定……”。答案为C。
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