What caused the accident was/were the stones on the road.choose which one and why

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What caused the accident was/were the stones on the road.choose which one and why
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What caused the accident was/were the stones on the road.choose which one and why
What caused the accident was/were the stones on the road.
choose which one and why

What caused the accident was/were the stones on the road.choose which one and why
不严格的讲,都对.
主语从句通常谓语动词用单数.但在口语中,可以根据表语的数来推断主语从句所指的是单数还是复数.
所以,非要选一个的话,就选were.
但并非一楼所说的倒装句,而是通过表语判断主语的数,主语还是what引导的从句

was
因为What caused the accident 是主语,名词性从句谓语动词用单数。

were stones 加了s了 ,所以是were 还有这个句子是倒装句

was
it was the stones on the road that caused the accident。