Question

Tom hid himself behind the door, _______ he rushed out to scare his mother.

1. A.
   which
2. B.
   where
3. C.
   from which
4. D.
   from where

Answer 1

D
from where为“介词+关系副词”结构，也可以引导定语从句。例如：We stood at the top of the hill，from where we can see the town.