doesn't want to know that which she is eager to know.这里为什么用which 而不用wha
问题描述：
doesn't want to know that which she is eager to know.这里为什么用which 而不用wha
而不用what?
答
He doesn't want to know that/the thingswhich she is eager to know
这是定语从句,先行词是that.
=He doesn't want to know (what) she is eager to know