John ______ be could improve his exam results, but he did not have enough time to study.

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问题 John ______ be could improve his exam results, but he did not have enough time to study.

选项 A、knows how
B、knows that
C、knew how
D、knew that

答案C

解析考时态和连词。根据从句可判断为过去时，排除选项A和B。how表示如何，符合题意。选项C是正确的。

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