I found difficult to make good friends with them.A. it isB. thisC. itD. that is

问题补充：

I found difficult to make good friends with them.

A. it is

B. this

C. it

D. that is

答案：

A. it is

B. this

(答案→)C. it

D. that is

解析：find it +形容词+to do sth 句型，“发现做某事怎么样”,it用来代替后面不定式的内容,不能用指示代词.