having been done 和 done 作状语时的区别 - 柯帕斯英语网()

having been done 和 done 作状语时的区别 - 柯帕斯英语网

1. having been done：强调动作发生在谓语动词表示的动作之前。例如： Having been well tended for half a year, my granny became far …