which和that的用法区别有：
引导非限制性定语从句时，通常要用which。直接放在介词后作宾语时，通常要用which。
当先行词有the very，the only，the same等修饰时，通常用that。当先行词有形容词最高级或序数词等修饰时，通常用that。
扩展资料
Which period of history would you most like to have lived in?
你最喜欢生活在哪一个历史时期？
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。
The schools approach must be complementary to that of the parents.
学校与家长的教育方法必须相辅相成。
I find it interesting that she claims not to know him.
她声称不认识他，我觉得真是耐人寻味。
Oh come now, things arent as bad as all that.
哦，好啦，情况并不是那么糟。
《牛津高阶英汉双解词典》
