I'll never forget the day on which\when I joined the party.解释一下为什么用这两个连词?

问题描述:

I'll never forget the day on which\when I joined the party.解释一下为什么用这两个连词?

这里的on原本应跟在the party后面,指‘the party on the day’,一般都会用when做介词,后面跟时间,但如果后面的状语可跟介词,也可以用这个介词加上which是一样的!