The desk,which I bought second-hand,is made of oak.

问题描述:

The desk,which I bought second-hand,is made of oak.
which是什么成分?放在这个位置总是觉得太别扭了

本句是定语从句,which做关系代词,引导定语从句,并指代前面的先行词“desk”,整句的意思是:我买的这张二手货书桌是由橡木制成的.
---建议你买些语法书来看看.