单项选择题

I think you probably know China has adopted a flexible policy ( )her foreign trade.

A. on
B. with
C. in
D. under
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These are goods insured ( ) all risks.
A. with
B. against
C. in
D./
单项选择题
The key ( ) the company's success was that it employed an excellent manager.
A. to
B. for
C. around
D. about
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