浓雾天气推送车列连挂车辆时，应派人在停留车前（）处显示停留车位置信号。
A.20m
B.10m
C.50m
D.30m
参考答案：C
— Look! Somebody _____the sofa.
— Well, it wasn't me. I didn't do it.
A．is cleaning
B．was cleaning
C．has cleaned
D．had cleaned
读了《富翁》这个故事，你有什么收获？
