Be careful when you cross the road in rush hours so as to avoidby a carA. being knocked d

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(答案→)A. being knocked down
B. knocking down
C. to be knocked down
D. to knock down
解析：考查非谓语动词作宾语的用法。Avoid后只接doing，且knock down 与其逻辑主语you 是被动关系，要用being knocked down,故选A。句意：在上下班高峰期过马路时你要小心，以免被车撞了。