2. 专升本
  3. Betty’s score on the test is the highest in her class. She________have studied very hard.

Betty’s score on the test is the highest in her class. She________have studied very hard.

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问题 Betty’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 may have done：(过去)可能做了……，表示对过去情况可能性的推测；should have done：(过去)本应该做……(却没有做)，相当于ought to have done；must have done：(过去)肯定做了……，(过去)一定做了……，表示对过去情况的肯定推测。根据句意可知，选C。
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