Johan’s score on the test is the highest in the group; he ______ last night.

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问题 Johan’s score on the test is the highest in the group; he ______ last night.

选项 A、should have studied
B、must have studied
C、has studied
D、should study

答案B

解析对过去的行为进行肯定推测，应用must have done结构，意为“一定做了某事”，因此B为正确选项。

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英语

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