This is the problem _______ you should pay attention.A.to which

问题描述:

This is the problem _______ you should pay attention.A.to which
不明为什么用to which

the problem后面接了一个宾语从句
这个从句完整的是
you should pay attention to the problem
有两种方法变成从句
the problem to which you should pay attention
the problem which you should pay attention to