问题补充:
around the Tian An’ men Square, the tourists from Iceland were taken to visit the Palace Museum.
A. Showing
B. Having shown
C. Being shown
D. Having been shown
答案:
A. Showing
B. Having shown
C. Being shown
(答案→)D. Having been shown
解析:非谓语动词辨析题。现在分词的完成被动式Having been shown与主语the tourists为被动关系,时间上表完成。“游客们参观了天安门广场后,又去参观了故宫博物院。”