This question is very difficult____________ .A.to understand B.for me to understand it 我认为B也不错,为什么不行呢?

问题描述:

This question is very difficult____________ .
A.to understand B.for me to understand it
我认为B也不错,为什么不行呢?

A正确.
B后面it 与the question重复了,所以错