单项选择题

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

A. knows how
B. knows that
C. knew how
D. knew that

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He （） Chinese history and knows a lot about it.

A. is strict with
B. is interested in
C. is satisfied with
D. is busy doing
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We'll get in all the wheat before the sun （）

A. will set
B. was set
C. set
D. sets
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