We found _____very difficult to learn Japanese.

问题描述:

We found _____very difficult to learn Japanese.
A. its B. itC. thatD. this
这道题我知道选it,但是,选it依据的是什么,这个我不太清楚,请高手给个确切的答案,谢谢!

选it没错,这里it是代词,代指learnjapanese,是这句话的形式主语