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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单项选择题
（）round the city, we were impressed by the city's new look.

A. Taken
B. Taking
C. To be taken
D. Being taken
单项选择题
So much （） his financial position that he can't sleep at night.

A. he worries about
B. he worried about
C. did he worry about
D. does he worry about
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