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

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问题 John’ s score on the test is the highest in the class; ______.

选项 A、he must have to study last night
B、he must have studied last night
C、he should have studied last night
D、he should study last night

答案B

解析句意：约翰的测验分数是全班最高的，他昨晚肯定学习了。本题考查情态动词的用法。must have done表示“过去一定做了某事”，是对过去情况的肯定推测，常用于肯定陈述句中；C项中should have done表示“过去本应该做某事，但实际上并未做。”根据句意可知应选B。

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