has been done 与had been done要怎么用啊?
has been done 是现在完成时的被动语态.
had been done是过去完成时的被动语态.过去完成时的概念是【相对过去的某个时间更早的】【过去】
如：
The work has been done.这项工作做完了/完成了.
The work had been done before you came.这项工作【在你来之前】做完了/完成了.
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