On June 16 it arrested the world’s attention Shenzhou9 spacecraft was successfully

问题补充：

On June 16, , it arrested the world’s attention Shenzhou9 spacecraft was successfully sent into the sky with the first Chinese woman astronaut.

A. that

B. what

C. if

D. why

答案：

(答案→)A. that

B. what

C. if

D. why

解析：本题中的it为形式主语，真正的主语从句位于句尾，通常用关系词that来连接，故本题选A。