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John's score on the test is the highest in the class ; （）he last night.

A.must study
B.should have studied
C.must have studied
D.is sure to study

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正确答案： C
答案分析：「句意」约翰的考试分数全班最高;他昨天晚上一定学习了。
「难点」表示对过去某一动作行为的猜测须要用must have done 这一句型结构。

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