I was drawing a horse the teacher came in.[ ]
A. while
B. as
C. when
D. the moment
答案:C
He pushed his way through the crowd, saying “_____.”
A.Never mind
B.With pleasure
C.Go ahead
D.Excuse me
货物列车应保压停车,直至发车前或接到车站准备开车的通知后,方能缓解列车制动。