large dog whereWhen I got home last night,I was frightened t

large dog where
When I got home last night,I was frightened to find that in front of my door___
A was seated a large dog B sat a large dog
C was a large dog seated D did a large dog sit
还有:I live where he lived.(地点状语从句)
I live in the house in which he lived.(定语从句)
是不是可以用in which 的地方都可以用where
I live in the house in which he lived.是不是可以说成I live in the house where he lived.