单项选择题

What we have to take （）the courses offered only for this term.

A. are
B. is
C. have been
D. has been

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

A. potential
B. unknown
C. secret
D. unlimited
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