has been doing还是 has done

has been doing还是 has done has been doing have been done区别 __we are doing has never been done before i has been doing 还是i have been doing He has been doing 【高三英语语法填空】为什么这里填has been doing 而不是has done? it has been done 谓语 55._______ has been done. Everything _____ has been done has been done和has done的具体区别 has been doing 的用法 has been doing sth+介词