英语语法Don't get off the bus until it _____A,stop B,stopped C,w

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英语语法
Don't get off the bus until it _____
A,stop B,stopped C,will stop D,has stopped
这里面选择D 的原因

其实按理来说如果将until看做一个条件状语的话,是可以用一般现在时的
Don't get off the bus until it stops 应该是可以的.
这是一个祈使句.过去时和将来时一定是错误的.
但是现在完成时,这里意在是强调一个“已经停稳”的状态.
也就是说“减速停车”(stop)的过程已经结束,这是下车才是安全的.
于是这里有一个先后发生的顺序问题,不是“停车的时候”你可以下车,而是“车已经停住了”也就是已经是静止状态了,你才可以下车.所以现在完成时是恰当的.事实上这里的“现在”完成时,也是一个条件从句,表示的也不是“现在完成”,而是一个条件状语的假设.与条件状语从句的“主将从现”是有一定的相似之处的.

英语语法Don't get off the bus until it _____A,stop B,stopped C,w Don't get off the bus until it ____ .A.has stopped B.stopped Don`t get off the bus until it ___(stop) Don't get off the bus until it ____ A.stopped B. Don't get off the bus until it __.(.A.stop B.stops) 英语语法时态do not get off the bus until it( has stopped)和It is t 把Don't get off the bus until it had stopped.翻译成中文 Don't get off the bus until it____(stop). Don＇t ＿ the bus until it has stopped.A.get along B.get to C. Don't get off the bus until it has stopped.为什么until后面用完成时不是 don't get on the bus ()it has stopped A until B unless not until 的时态问题Don't get off the bus until it __(stop)该填什么时态