around the university, we then were taken to a building, many scientists worked.A. Showin

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A. Showing; where
(答案→)B. Having been shown; where
C. Having shown; which
D. Being shown; that
解析：考查分词做状语和定语从句。本题中的动词show与句子主语we构成逻辑上的被动关系，可以使用shown也可以使用having been shown；having been shown更多强调的是已经完成，shown强调的是被动。第二空是定语从句，先行词是a building,后面的定语从句句子结构很完整，则使用关系副词where在句中做状语。句意：被带领着参观完大学以后，我们被带去了一个大楼，很多科学家在里面工作。故B正确。