Hurry up! The train        . You know it        at 8: 30 am.

A．leaves; leaves

B．is leaving; leaves

C．leaves; is leaving

D．is leaving; is leaving

下述属于车站调度职责的是：（）。

A、指挥在站班车按规定有序停放，节约场地面积

B、要求当班司乘人员整理制服仪容，提前进入预定发车位，做好发车准备

C、保持足够的发车位，保障出行通畅

D、根据运力组织筹划，按班次计算所需车辆