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

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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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