which不能引导什么从句

which不能引导状语从句。
which：pron、/det、哪一个;哪一些;(明确所指的事物)…的那个，…的那些;(进一步提供有关某事物的信息)那个，那些。

You must signal which way you are going to turn、

你要朝哪个方向转，必须发出信号。

There are two points which I wanted to make、

我想要指出的、有两点。

We are still friends, though, which is good、

不过我们仍然是朋友，这令人感到欣慰。

Which part of Japan do you e from?

你是日本哪个地区的人？

There is some noise in the data which needs to be reduced、

资料里有一些需要删除的不适用信息。