If you cross the street carelessly,you risk ______(knock) down by a car.

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If you cross the street carelessly,you risk ______(knock) down by a car.

being knocked
risk + doing
在句中应使用被动,被汽车撞
所以是 you risk being knocked down by a car.

being knocked
risk doing
knock down对你是被动

will be knocked

will knock