With time going by, we have e to realize that creativity is it takes to keep a nation highly petitive.
A. what
B. how
C. why
D. that
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(答案→)A. what
B. how
C. why
D. that
解析: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。