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

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

选项 A、for
B、in
C、to
D、on

答案D

解析 place restrictions against/on是习惯搭配,意为“限制……”。应选D。
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