[译] 他们被领着参观了实验室以后，去了图书馆。
[误] Having shown around the labs, they went to the library.

[正] Having been shown around the labs, they went to the library.
[注] “show somebody around”意为“带领……到某处”。在该句中，主语是前面分词短语的逻辑主语，表达一种被动意义，因此用现在分词的完成式的被动，作状语。