to be done是不定式一般式的被动语态、如A lot needs to be done.有一系列工作要做.
having been done是现在分词完成式having done的被动态.表示该动作发生在主句动作之前已经做完.如：Having been cleaned ,the classroom is tidy now.
to be done 和having been done的用法
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非谓语动词having been done,to have been done什么时候用?