什么是现在分词完成时的被动语态?能举个例子吗?

题目

什么是现在分词完成时的被动语态?能举个例子吗?

答案

就是 having done的被动语态,having been done,在主句谓语动作之前发生的、和主句主语为被动关系的动作,通常作状语.比如,Having been showed around the Water Cube,we were then taken to see the Bird's Nest for ...