英语中 what happened?和 what happens?有什么区别 分别怎么用

英语中 what happened?和 what happens?有什么区别 分别怎么用 what happened to 和what happened What happened?英语的中文 What happened和what's happened有什么区别呀? What has happened和What was happened区别 what happened ?和what has happened ?的区别 What happened 的意思和用法 what happened 和what did happen的区别 what happened和what is going on 的区别急! what happen和what happened有什么区别 英语解释句子:What happened to you?用英语回答 what happened to you和what's happened to you的区别那个对? what happened to you 和what has happened to you有什么区别 What has happened和What happened的区别另问过去时与现在完成时的区别 what on earth happened?和what happened on earth?哪个对? what happened to sb和what's happened to sb区别 what happened to 和 what had happened to的区别是什么? what happened 和what has happened 有什么区别么请问