Of course workers who don't join the strike may risk ________ when they leave the factory．
A.attackingB.to attackC.being attackedD.to be attacked在线课程C
解析：
动词risk的用法是risk doing sth意思是：冒险做某事。根据句子的意思“工人是冒着被攻击的危险”。所以在这句句子中应该用被动语态being attack。