what has happened是什么时态的句型

what has happened是什么时态的句型 what has happened?为什么用HAS what happened what has happenedwhat happened what has happened 在语义上有什么区别吗 What has happened和What was happened区别 what happened ?和what has happened ?的区别 what has happened.这个句式有错吗 What has happened?What has happened?---I have lost my key and can't open the door.为什么不能用What happened?---I lost my key and i can't open the door.两者的区别是什么? do you know what ( ) just now.A.was happened B.happened C.has happened D.has been happened 是what has happened to还是what has happened at快,还有后面加什么! 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 I wanted to know_to him.为什么填what happened而不是what has happened? what happened 和what has happened 有什么区别么请问 WHAT HAD HAPPENED这是什么形式 What happened?是什么句型?是不是疑问句 No matter what ( )happened to you.用have还是has what has happened to you这不是被动语态吗? What on earth has happened to make you so upset?