the ___caused by carelessness__yesterday,Many workers were killed.A incident,was happened

题目

the ___caused by carelessness__yesterday,Many workers were killed.A incident,was happened
B matter,happened C event,was taken place D accident,took place选什么 为什么

答案

D
从下文“许多工人丧生”,可见是事故发生
happen 是不及物动词,不可以用于被动语态