he ran toward the coming train，——his camera is flash towarn the driver of the danger.

Ato fire B firing C fired D having fired,求详细的解释

你的题目明显错误，原题是
He ran toward the coming train, ______ his camera’s flash to warn the driver of the danger.
答案选 B, 这是同时进行的动作。他向迎面而来的火车跑去，用闪光灯来警示司机有危险。

b,表当时伴随的动作。 再看看别人怎么说的。