哪些介词加 which可以引导非限定性定语从句？
所有搭配合理的都可以，包括in, on, at, about, of, over, around, beyond, between, from, to, into, out of, outside, inside, onto, by, among, with, under, above，through。
一、非限制性定语从句.介词的使用方法
在定语从句中,一般有两种情况会在关系代词前出现介词：
1、与先行词有关的介词可以放到关系代词前,如：
I won't forget the days in which we worked together.(因为in the days,所以 in which)
2、与定语从句中的谓语动词相关的介词会放到关系代词前,如：
The boy about whom they often talk is very kind.(因为talk about,所以about whom )
注：第二种情况是完全可以将介词放到原有的位置（定语从句的谓语动词后）,这时关系的范围就大了很多,如The boy whom/who/that/不填 they often talk about is very kind.
如果介词在关系代词前,关系代词要么是which（先行词是物）,要么是whom（先行词是人）.
二、as和which引导非限制性定语从句的区别
区别：
1）as可指其前后主句提到的事实或情况，因此引导的非限制性从句位置比较灵活，which可以放在主句前后，也可插入主句之中；而which引导的非限制性从句只能位于主句之后：
As is known to all, fish can’t live without water.
Air, as we know, is gas.
2）在非限制性从句中，which后的be动词不可省；as而后的be动词可以省略：
She told me she won the match , which was a lie. The material is elastic, as (was) shown in the figure.
3） which在非限制性定语从句做主语时可用各类动词做谓语；而在非限制性定语从句做主语时，谓语常用连系动词，如be, seem, become等，一般不用其他行为动词：
He saw the girl, which delighted him.
He didn’t say anything at the meeting , as/which seemed very strange.
4） 如果主句中叙述的事情与从句所涉及的意向一致，多用as，用以对主句的意义进行补充；如果不一致，就用which：
She has married again, as was expected.
He broke the rules again, which was unexpected.
