this is the house where he lived last year.
=.this is the house in which he lived 【没有in】last year.因为in提前了
两句是一样的
先行词【house】在从句中作地点状语
【he lived in the house】所以用where
又因为是【live in the house】,所以where=in which
这种where=介词+which的主要看的是搭配
有不会的可以再问我