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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单项选择题
It is a small country, yet has a lot of （） resources.

A. potential
B. unknown
C. secret
D. unlimited
单项选择题
Don’t let that old rascal take you （） with his clever talk—none of it is true.

A. along
B. in
C. about
D. down
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