The Chinese abacus(算盘), officially as a cultural heritage at the 8th Annual UNESCO World Heritage Congress, is another symbol of Chinese wisdom.
A. having listed
B. listed
C. having been listed
D. listing
网友回答
A. having listed
(答案→)B. listed
C. having been listed
D. listing
解析：--在第8次UNESCO的世界遗产会议上被官方列为世界文化遗产的中国的算盘是中国智慧的又一个象征。这里需要非谓语做定语，修饰The Chinese abacus，因为The Chinese abacus和list是被动关系，所以用过去分词做定语，选B。