介词后，只能用which，不能用that。
【俊狼猎英】为您解答。
1.从句中谓语动词搭配的介词提前，可用which
2. 定语从句中作状语的关系副词可代替
where=in/on which why=for which when=on/in which
定语从句中可以用介词+ which。
通常介词后不接that从句，但可以说 except that或in that。
如：I know nothing except that he is a teacher.
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