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what had happened happened again,这句语法对么,或者怎样改,

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what had happened happened again,这句语法对么,或者怎样改,
what had happened happened again,这句语法对么,或者怎样改,
时态和句型上都是正确的
what had happened是本句的主语从句 happened 是谓语动词
由于谓语动词用的过去式 所以主句应该是过去的过去用过去完成时 正确
what had happened happened again,这句语法对么,或者怎样改, what do you think had happened to him. 这句话在语法上怎么用句 What had happened?What had happened?What had happened? what happened?语法对吗 WHAT HAD HAPPENED这是什么形式 what is wrong had happened? what had happened和 what has happened有什么区别 what happened what had happened 有什么区别呢 What happened 的答句 What had she happened?改为宾语从句 Tell us all what had happened He d____ exacxtly what had happened.