the accident which ——by the driver ‘s being drunk killed three people.
问题描述：
the accident which ——by the driver ‘s being drunk killed three people.
A was caused B caused C to be caused D having been caused
答
选择A.which ——by the driver ‘s being drunk 是定语从句,修饰accident.这个从句中缺少谓语部分,所以cD排除掉.是被动（by the driver ‘s being drunk ),被动由be 动词加动词的过去分词构成,所以选C.如果这句话中没有which ,选B.是独立主格的语法现象cause 与accident 是被动关系.