What accident? You mean Christina's?

什么事故？你是说克里斯蒂娜的那次吗？

《柯林斯英汉双解大词典》

What accident happened yesterday?

昨天发生了什么事故？

youdao

What happened just before the accident was expunged from his memory.

事故前一刻发生的事他都记不得了。

《牛津词典》

The story also tells what could happen to a person who had an accident.

VOA: special.2009.02.11

If it's an accident, what's it an accident from?

如果是偶然事件，它的偶然成因是什么？

耶鲁公开课 - 心理学导论课程节选

In nineteen eighty-eight, Adair fought what was possibly the world's worst off-shore accident.

VOA: special.2009.03.22

People like Mrs Luebbe, in contrast, are against it for fear of what an accident might do to her livelihood.

ECONOMIST: Debating the Keystone XL pipeline

Independent reports by military aviation experts, a fatal accident inquiry in Scotland and other investigations had all concluded that there was no conclusive proof of what caused the accident, he said.

BBC: Chinook inquiry judge named

The Department of Civil Aviation in the UAE has ruled out terrorism, although it is not yet clear what caused the accident.

BBC: NEWS | Middle East | Eyewitnesses tell of Emirates crash