Question

非谓语中done和having been done的区别是什么？

Answer 1

过去分词done表示（1）被动动作，（2）动作完成。
If heated, water is changed into vapour.
如果加热水就会汽化。
现在分词被（精）动语态完成（锐）式having been done表示（1）被动动作，（2）动作已在谓语动词的动作之前发生或完成。　　　　
Having been shown around the lab, the guests were taken to see the library.
客人们参观完了实验室后又被带去看图书馆。 句中having been shown意在强调它发生于谓语动词were taken之前。