what caused the accident _____on the road.

来源：百度知道编辑：UC知道时间：2024/05/15 19:49:31

A. were stone
B. were stones
C. was stone
D. was stones
为什么选D?
由what引导的主语从句，谓语动词通常用单数，但所指的具体内容是复数意义时，谓语动词一般用复数形式
What we need are doctors.
那么这道题选D如何解释呢？

这句话的主语是一个主语从句"what caused the accident",所以是单数的.这种情形下这个was与stones没有什么关系,不会用were.

what引导的是定语从句
导致此次交通事故的是路上的石头

what 是表示引起事故的原因，相当于不可数名词，所以后面跟was
单数形式可以用the stone, 但不能仅用stone,用复数形式则为stones

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