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

試題分析：考查非限制性定語從句：句意：我們都知道的是，美國是很有競爭力的。As引導非限制性定語從句，指代后面的主句內(nèi)容，在定語從句中做主語，賓語或表語，which也可以引導非限制性定語從句，但是不能放在句首，what不能引導定語從句，that不能引導非限制性定語從句，選A。
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