Question

英语语法问题-想找一些at which引导的从句看看

Answer 1

from thefreedictionary.com:

at which:

At which station should I change trains?

in which ...:

My father may have to go into hospital,in which case he won't be going on holiday.

for which:

The documents for which they were searching have been recovered.

这里的at,in (case),for都是需要跟后面句子搭配的,即：

I change trains AT some station.

in this/that case 是个固定搭配.

They were searching FOR the documents.