turn off the light ___you leave the meeing

问题描述:

turn off the light ___you leave the meeing
A until B but C before D after

C before
该不是 meeting 而已吧,meeting room 比较合理.是的有个room还有为什么不是D?设想一个人已经离开后怎么关灯呢?所以用 before 是表达“离开这间屋子之前把灯灭了”