“到底发生了什么事?”用英语翻译,特别是“到底”怎么翻译?

问题描述:

“到底发生了什么事?”用英语翻译,特别是“到底”怎么翻译?

What's the hell going on? (hell)

What on earth has happened?

What happened on earth?
on earth 究竟,到底