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 句意:约翰的考试分数全班最高,他昨天晚上一定学习了。表示对过去莱一动作行为的猜测须要用 must have done这一句型结构。
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