In his speech, Premier Wen Jiabao points out that creativity is it takes to keep a nation highly petitive .
A. how
B. what
C. which
D. that
网友回答
A. how
(答案→)B. what
C. which
D. that
解析：B “ it takes to keep a nation highly petitive .”做表语从句，从句中缺少takes的宾语，构成 it takes sth to do sth 结构。