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

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What had happened?What had happened?What had happened? 是What happened 还是what’s happened what happened=what's happened吗? what happened to 和what happened what happened/what was happened/what is happened/what happen/what is happeniwhat happened/what was happened/what is happened/what happen/what is happening这些用法都有吗 what happened at last? what happened on What Happened to Us what happened then Dear,what happened to what happened to she what happened to him? What happened then. What happened then 翻译 what happened是什么意思 what happened to what happened to the . What happened 、 什么意思