题目内容：

定语从句中 on which ,at which,in which 怎么 用
i'll never forget the day____I joined the league
要 .分别什么情况下用

优质解答

on which.the day对应which.I join the league 在具体的某一天用on.后半句展开来就是 I join the league on the day.which 作the day的定语.on the day变成on which.
还不明白可以百度HI