()the policeman approaching, the driver brought his car to a hal

()the policeman approaching, the driver brought his car to a halt quickly.
A、Saw
B、Having seen
C、Seen
D、Seeing
【正确答案】：D
【题目解析】：虽然从句表示的动作先发生，但由于是瞬间完成的，而且主句表示反应或行动，不用完成时。