the blind wandering through the traffic, motorists would have to step on their brakes at once.
A. Seeing
B. Having seen
CSeen
D. To have seen
网友回答
(答案→)A. Seeing
B. Having seen
C. Seen
D. To have seen
解析：考查现在分词做状语：句意：看见盲人在车辆中徘徊，汽车驾驶员要立刻踩刹车。因为motorists和see这个动作是主动关系，用现在分词做状语。选A。