分类：教育/科学-外语学习-英语考试
问题：怎么判断这个句子该用什么形式的非谓语动词?_________ar 
_________ around the Water ube, we were then taken to see the Bird’s Nest for the 2008 Olympic Games.A. Having shown    B. To be shown    C. Having been shown    D. To show
回答：C,因为参观水立方的动作发生在参观鸟巢之前,既然后面的动作都用过去时态了,故前面那个是过去的过去,用have 形式，且因为是被动，因此为Ｃ．