____the cry for help,people immediately rushed out of the roomsA. TO hear B.Hearing C.Having heard D.They hearingB和C哪个对?2.Don't get off the bus until it____A.is stopped B.will stop C.has stopped D.should stop

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____the cry for help,people immediately rushed out of the rooms
A. TO hear B.Hearing C.Having heard D.They hearing
B和C哪个对?
2.Don't get off the bus until it____
A.is stopped B.will stop C.has stopped D.should stop

1.B Hearing是说听到的同时跑出去,Having heard是说听到之后过了很久才跑出去
   按常理,听到呼救,应该是立刻跑出去
2.C 等车停好了,才下车.时态应该是现在时,停好了才好,表完成.应该用现完