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

解析语法结构题。本句的意思是：约翰的考试分数全班最高；他昨天晚上一定学习了。本句的难点是：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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John’sscoreonthetestisthehighestintheClass;he______lastnight.A、mus