what happened /what has hanppend/what has been haapening

问题描述:

what happened /what has hanppend/what has been haapening
这3个有什么区别.怎么使用?请给例句加以说明~
一时手快.打错 单词.上面那3个都是HAPPEN

三句话都可以翻译成:“发生了什么事?”
What happened?是过去时,单纯问过去发生的事情;
What has happened?强调发生的事情对现在的影响 ;
What has been happening?强调发生的事情一直延续到现在(现在依然没有结束,还在发生中).