问题描述：
Miss Li often tells her students not to get off the bus until it________
A.has stopped
B.stopped
C.will stop
D.shall stop
为什么不能选B呢?
A.has stopped
B.stopped
C.will stop
D.shall stop
为什么不能选B呢?
问题解答：
我来补答展开全文阅读