With time going by, we have e to realize that creativity is _______it takes to keep a nation highly petitive.A.whatB.howC.whyD.that
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A解析试题分析：考查表语从句。本题what引导表语从句what it takes to keep a nation highly petitive.并在句中做takes的宾语。句意：随着时间的流逝，我们逐渐意识到创造性是让一个国家有竞争力需要的事情。故A正确。考点：考查表语从句
点评：表语从句的考查主语是考查连接词在句中的作用和充当的成分。