定語從句in which 的用法

題目：

定語從句in which 的用法

解答：

你的問題中提到的in which是屬於「介詞+關係代詞」型的定語從句.
關係代詞在定語從句中做介詞賓語時,從句常由介詞 + 關係代詞（只用 whom /which）引導
The school (that/which) he once studied in is very famous.
= The school in which he once studied is very famous.
Tomorrow I will bring here a magazine (that/which) you asked for.
= Tomorrow I will bring here a magazine for which you asked.
We'll go to hear the famous singer (whom/that/who) we have often talked about.
= We'll go to hear the famous singer about whom we have often talked.