单项选择题

The U.S. government places rigid restrictions （）the type of high-technology products that can be exported to China.

A. for
B. in
C. to
D. on

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单项选择题

The company management attempted to（）information that was not favorable to them, but it was all in vain.

A. supplement
B. suppress
C. plug
D. concentrate

单项选择题

（）widespread belief, cockroaches (蟑螂) would not take over the world if there were no one around to step on them.

A. In view of
B. Thanks to
C. In case of
D. Contrary to

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