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_________we all know, Americans are competitive.

A.As B.Which C.What D.That

A

解析试题分析:考查非限制性定语从句:句意:我们都知道的是,美国是很有竞争力的。As引导非限制性定语从句,指代后面的主句内容,在定语从句中做主语,宾语或表语,which也可以引导非限制性定语从句,但是不能放在句首,what不能引导定语从句,that不能引导非限制性定语从句,选A。
考点: 考查非限制性定语从句

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