around the lab we were taken to see the library.A. Being shownB. ShowingC. Having been s

问题补充：

around the lab, we were taken to see the library.

A. Being shown

B. Showing

C. Having been shown

D. To show

答案：

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。