就是一个时态引起的意思不同的问题.
After having done就是说在已经做了什么多久之后,一般后面要跟个像for many days类似的时间状语.同时还有强调“已经”的含义.比如：
After having done my homework for 2 hours,I .在我已经完成作业2小时后.
而After doing就是简单的说在做了什么后.比如：
After finishing my homework,I .在我完成作业后.
after having done与after doing 区别 新概念英语2第20课中
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