He was very unforthcoming about what had happened.

他对发生的事守口如瓶。

《牛津词典》

What happened? Was there anything important in it?

发生了什么事？里面有什么重要的东西吗？

youdao

What was the point in living in the past, thinking about what had or had not happened?

活在过去有什么意义，思考已经发生的或者没有发生的事情？

《柯林斯英汉双解大词典》

This week in our series, Harry Monroe and Kay Gallant tell what happened after President Garfield was shot.

VOA: special.2010.04.29

He's narrating in great detail what happened while he was in the womb. Where does this knowledge come from?

他花了很大笔墨很详细地描写了,他还在子宫里发生的事，但他是怎么知道的呢？

耶鲁公开课 - 1945年后的美国小说课程节选

He asks the gods what has happened to Lycidas and who exactly was responsible for the sinking of Lycidas' ship.

他问众神利西达斯怎么了,是谁让他的船沉没的。

耶鲁公开课 - 弥尔顿课程节选

It bears watching because we understand the impact that what happened -- what was happening and what happened in Greece had on our recovery last spring, so obviously it is something that the President has received updates on during his economic daily briefings.

WHITEHOUSE: Press Briefing

Defence lawyer Martin Morgan said that while what happened was a "vicious attack", it had "happened in the heat of the moment" in what was "a moment of madness".

BBC: Belfast man jailed for biting off part of his partner's ear

And it was very comforting to know that I could still do that, or that that was what happened when I was left alone to my own devices.

NPR: Tift Merritt Will 'See You On The Moon'