求have been doing的意思和用法

求have been doing的意思和用法 have been doing 的用法, have been doing have done 的用法和区别 have been in的用法和意思 will have been doing和have been doing的区别 have been doing 和have done 还有had done三者的区别,用法 have been doing与 have done的用法区别 have been in的用法和意思是什么 have been do和have been doing的不同 have been doing 神马意思? “have been "的用法及意思 have been done 和 have been doing