问题
选择题
Tom hid himself behind the door, _______ he rushed out to scare his mother.
A．which
B．where
C．from which
D．from where
答案
答案：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.