首先，先看have,如果是have就是动词，后面不管跟什么，都是动词的功用，表完成时态，而having就是独立结构；后面的be done或者be doing就是一个是被动，一个是正在做的事情；这样你有木有懂？按着顺序分析各个词语，你这么问，就表示，你这个语法点有问题。建议你仔细学习一下独立结构doing, to do; 完成时态，及被动语态
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having been done与having been doing
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