Don't get off the bus until it ____A.has stopped B.stopped C.will stop D.shall stop

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Don't get off the bus until it ____A.has stopped B.stopped C.will stop D.shall stop
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Don't get off the bus until it ____A.has stopped B.stopped C.will stop D.shall stop
Don't get off the bus until it ____
A.has stopped B.stopped C.will stop D.shall stop

Don't get off the bus until it ____A.has stopped B.stopped C.will stop D.shall stop
选A
现在完成时表示过去发生的事情对现在造成的影响,巴士停好了,才能安全下车.
这个空还可以填stops,那是在条件状语从句中用一般现在时表将来.

A.has stopped
这是一句祈使句,it指代bus,所以不能选D
A表示已经停下来这种状态
B表示停下来的动作
C表示将要停下来