Turn off the light __ you leave.

问题描述:

Turn off the light __ you leave.
A after
B before
C until
D when
请写出原因

d
离开时关灯
after 离开后关灯逻辑错误
before 离开前关灯 同上
until 关着灯,直到离开 (人在屋里的时候不开灯,走了再打开) 还是逻辑错误