around the lab, we were taken to see the library.
A. Being shown
B. Showing
C. Having been shown
D. To show
网友回答
A. Being shown
B. Showing
(答案→)C. Having been shown
D. To show
解析：考查非谓语动词。we和show是动宾关系，应该使用过去分词或被动，排除B、D；当两个动作有先后关系时，应该使用having done。参观过实验室之后，我们被带去看图书馆。故选C。