题目
had+过去分词 had+been过去分词 写成句子分别是那里.最好详细一点.
提问时间：2020-12-04
答案
had done 是已经做过某事
had been done是某事已经被做过
he had cleaned the room.他已经打扫过了房间.
the room had been cleaned by him.房间已经被他打扫过了.
had been done是某事已经被做过
he had cleaned the room.他已经打扫过了房间.
the room had been cleaned by him.房间已经被他打扫过了.
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