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问题: I find it difficult to do

Was the job very easy?
Not at all, I found __________
A.it is difficult to do it
B.it difficult to be done
C.it difficult to do it
D.it difficult to do.

解答:

简单来说,这是一个基本句型:

Sb. finds sth. adj. (for sb) to do.某人发现什么事情(让他)来做怎么样

这里do的逻辑主语是I,不是it。