This is the house in which Tom once lived中in 为什么要放在which前面
问题描述：
This is the house in which Tom once lived中in 为什么要放在which前面
答
in which = where定语从句,从句部分必须是个完整句,Tom once lived 是完整句式,但是 Tom once lived in 就不是完整句了,因为少了宾语,改成完整句是——Tom once lived in the house.所以当用到定语从句的时候只能把i...