It was last night_______ Mr. Brown came back to his hometown from Africa.

A．when

B．where

C．that

D．who

运行中机车走行部发生故障或有异常情况时，司机应立即停车。经检查若无法处理或难以判明故障情况时，司机应立即报告两端站车站值班员及列车调度员（段调度员）。严禁（）。