2. 外语
  3. John’s score on the test is the highest in the class; he ______ last night.

John’s score on the test is the highest in the class; he ______ last night.

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问题 John’s score on the test is the highest in the class; he ______ last night.
选项 A、must study
B、should have studied
C、must have studied
D、is sure to study
答案C
解析 根据题干可知，后一分句是对过去，情况的推测，可直接排除A 和D 。B  should have studied表示过去本应该学习而实际上并未这样做，故答案为C 。
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