Jim’s score on the test is the highest; he______hard.

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问题 Jim’s score on the test is the highest; he______hard.

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

答案C

解析 should have done和could have done的意思均为“本该做……”，言下之意是并没有做后面的动作。must have done的意思为“一定做了……”，could do的意思是“能做……”。正确答案为C。

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