高中定语从句：The drunk driver is to blame for the traffic jam ___ yesterday.
问题描述：
高中定语从句：The drunk driver is to blame for the traffic jam ___ yesterday.
A. that occuredB. occured
选A.为什么不能省略that?
答
that occured yesterday是做 the traffic jam的定语从句.并且that 做的是从句中的主语,此时做主语是不能省的,不然句子中具有两谓语动词,一个句子中是不能出现两个谓语动词的.只有当that 作宾语时才可省.