"Have done" 和 "have been done" 是两种不同的完成时态结构，它们的区别和用法如下： 1. " Have done " 是 现在完成时态 的结构，用来表示过 …
1. having been done： 强调动作发生在谓语动词表示的动作之前。例如： Having been well tended for half a year, my granny became far …
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