It is said was how Chinese characters developed.A. thatB. that whichC. that thatD. what

问题补充：

It is said was how Chinese characters developed.

A. that

B. that which

C. that that

D. what

答案：

A. that

B. that which

(答案→)C. that that

D. what

解析：“据说那就是汉字的形成。”It is said that “据说”，同时从句中没有主语所以会出现两个that，答案C。