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

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问题 John______he 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

解析考查时态和连词。根据从句可判断为过去时，排除A项和B项。how表示“如何”，符合句意。C项是正确的。句意为：“约翰知道如何提高考试成绩，就是没有足够的时间学习。”

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