问题

_____, the car stopped all at once.
A:Seeing a boylying on the ground
B:On seeing aboy sitting on the road
C:The driversaw a boy standing on the road
D:The minutethe driver saw a boy seated on the road
B:On seeing aboy sitting on the road
C:The driversaw a boy standing on the road
D:The minutethe driver saw a boy seated on the road
正确答案是: