Question

9.        was that I saw some villagers sitting on the bench at the back of the room. (surprise)

令我惊讶的是我看到一些村民坐在房间后面的长凳上。

Answer 1

9. What surprised me空白处为主语从句，was后为表语从句。主语从句中what是主语，不可用it或that代替。