如下.问题补充中.应该选什么?为什么?

题目

如下.问题补充中.应该选什么?为什么?
It —— that China has achieved her dream of flying to space.A.said B.proved C.has proved

答案

选C.
It is said tha...据说,A答案缺了 be 动词.
从句 that China has achieved her dream of flying to space 用了现在完成时,主句要用现在时态,故B 不选.