题目内容

_________we all know, Americans are competitive.
A．AsB．WhichC．WhatD．That
A

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。
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