what had happened和 what has happened有什么区别翻译和用法上有什么区别“he told me what______ ” 中填这两个回答有什么不同的效果

What had happened?What had happened?What had happened? what happened to 和 what had happened to的区别是什么? What happened和What had happened意思 区别?使用的区别,在什么情况下使用? what is wrong had happened? what happened what had happened 有什么区别呢 what happened to 和what happened What had she happened?改为宾语从句 He d____ exacxtly what had happened. WHAT HAD HAPPENED这是什么形式 I asked him what had happened 为什么要用had happened 而不直接用happened what is happening 和 What is happened和 what had hwhat is happening 和 What is happened和 what had happend 这三个对吗?对的话有什么区别 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 there are no w（） of finding uot what happened He asked,What has happened to you?变为间接引语该怎么变是He asked what had happened to me.还是He asked what I had happened . what had happened happened again,这句语法对么,或者怎样改, 宾语从句中的what和thatThe old woman was shocked by what had happened to her daughter.这句话中what可不可以用that代为什么