In his speech, Premier Wen Jiabao points out that creativity is ______it takes to keep a nation highly competitive .  
A．howB．what C．which D．that
B
“__it takes to keep a nation highly competitive .”做表語從句，從句中缺少takes的賓語，構(gòu)成 it takes sth to do sth 結(jié)構(gòu)。
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