The Canadian tourist hurried to the station, only _____ that the train had pulled out of the station.[ ]

A. telling

B. to tell

C. to be told

D. having been told

保护范围相同的四边形方向阻抗继电器、方向阻抗继电器、偏移圆阻抗继电器、全阻抗继电器，受系统振荡影响最大的是（）。

A.全阻抗继电器；

B.方向阻抗继电器；

C.偏移圆阻抗继电器；

D.四边形方向阻抗继电器。