I regretted having been so rude to him,这句为什么用having?

I regretted having been so rude to him,这句为什么用having? I regretted having been so rude to him,如果把having改为have会有什么意思 John regretted not having been going to the meeting last wee I regretted —— that to her.A.having said B.to have said C to ___an engineer,so he knows exactly what to do为什么选having been 为什么是There having been? to having been doing 和having been doing 的区别 I have having been never changed to Your feeling Not having got any answer,he was rather worried.这句为什么用having I remember having seen him somewhere 这里have 为什么用ing 请问为什么要用having been separated?而不是用to be separated? 用having been done 造句