问题
选择题
In his speech, Premier Wen Jiabao points out that creativity is ______it takes to keep a nation highly competitive .
A．how
B．what
C．which
D．that
答案
答案：B
“__it takes to keep a nation highly competitive .”做表语从句，从句中缺少takes的宾语，构成 it takes sth to do sth 结构。