the car stopped all at once.A. Seeing a boy lying on the roadB. On seeing a boy sitting

问题补充：

, the car stopped all at once.

A. Seeing a boy lying on the road

B. On seeing a boy sitting on the road

C. The minute the driver saw a boy seated on the road

D. The driver had seen a boy standing on the road

答案：

A. Seeing a boy lying on the road

B. On seeing a boy sitting on the road

(答案→)C. The minute the driver saw a boy seated on the road

D. The driver had seen a boy standing on the road

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