A:Please don't leave the room until your homework _______.

问题描述:

A:Please don't leave the room until your homework _______.
B:OK.
A.finishes
B.is finished
C.will be finished

B
别离开这个房间知道你的家庭作业完成.
家庭作业时被完成,所以要用被动时态
Until引导的从句不可以用将来时.