I found______very easy to learn English well if you put your

I found______very easy to learn English well if you put your heart into it.
A.that B.this C.it

C.it.
再问： 解释
再答： 习惯用法，it作为形式主语，本来是 It is very easy to ..... 把I find that和前面那句连在一起就是这样省略。