which,in which,on which,for which ,of which 有什么区别，在定语从句中怎么用？

如：That is the day ( ) I'll never forget. A.which B.on which C.in which D.when

选A。
which在限制性定语从句中就是指先行词，如题中的which就指先行词the day,在从句中作动词forget的宾语。
"介词+which"不能只从意思上区别，介词的选择主要有3方面
1，考虑先行词与介词的固定搭配。
This is the farm on which he is working .
on the farm 是固定搭配。
2，考虑句意的需要。
This is a factory into which he wants to go .
go into the factory .
He is one of my friends with whom i am living .
live with sb .
3, 考虑 定语从句谓语动词的固定短语所需什么介词。（这种情况尤为多些）
This is a book in which i am interested .
be interested in sth .

in which可以翻译成在……里面 for which可以翻译成为了……目的 on which可以翻译成在……的上面，或具体时间的某一天 at which可以翻译成在……里面或在……上面

主要是看后面状语的搭配

比如，i live in guangdong,in which(=where) crops grow here.

这里后面的意思应该是，crops grow in guangdong ,所以用in（地点）

i caught the bus ,on which i met my teacher.

这里后面的意思应该是i met my teacher on the bus,所以用on（地点）

i like ,by which i improve my english

这里应该是 i improve my english by reading english.所以用by（方式）

i like skiing,from which i can get a lot of happiness.

这里是 i can get a lot of happiness from skiing。所以用from

做这种题，你先看看后面那个从句里要搭配什么样的介词，做熟了就容易了。

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