关系代词that前可以用介词吗

不可以。
关系代词用来引导定语从句。它代表先行词，同时在从句中作一定的句子成分。关系代词有主格，宾格和属格之分，并有指人与指物之分。
关系代词that 的用法 　　
1）不用that的情况
a) 在引导非限定性定语从句时 (错)　The tree, that is four hundred years old, is very famous here.
b)介词后不能用 We depend on the land from which we get our food.
2) 只能用that作为定语从句的关系代词的情况
a)　在there be 句型中，只用that，不用which。
b)　在不定代词，如：anything, nothing, the one, all, much, few, any, little等作先行词时，只用that，不用which。
c)　先行词有the only, the very.（恰恰，正好）.any. few. little. no. all 修饰时，只用that。　
d)　先行词为序数词、数词、形容词最高级时，只用that。
e)　先行词既有人，又有物时。
Finally, the thief handed everything that he had stolen to the police.　那贼最终把偷的全部东西交给了警察。
不能用关系代词Which 的几种情况
1.当先行词为all, little, much, few, everything, none 等不定代词时关系代词用that而不用which.
There are few books that you can read in this book store.
2.当先行词既有人又有物时,关系代词用that, 不用which.
He asked about the factories and workers that he had visited.
3.当先行词有形容词最高级修饰时,关系代词用that, 而不用which.
Guilin is one of the most beautiful cities that I have ever visited.
4.当先行词有序数词修饰时,关系代词用that, 不用which.
The first sight that was caught at the Great Wall has made a lasting impression on him.
5.当先行词被the only, the very, the same, the right等修饰时,关系代词用that,不用which.
It is the only book that he bought himself.
6.当先行词被all, every, any, much, little, few, no等修饰时,关系代词用that,不用which.
There is no clothes that fit you here.
7.当主句是以which开头的特殊问句时,定语从句关系代词一般用that而不用which.
Which of the books that had pictures was worth reading?
8.在强调句型" It is ... that ..." 中,只用that,不用which.
It is in this room that he was born twenty years ago.

温馨提示：答案为网友推荐，仅供参考

当前网址：https://verywind.cn/ee/e7jjvrjv33xxjee3y32.html