Xi’an is one ofcapitalin China. A. older cityB. the older cityC. oldest citiesD. the ol

问题补充：

Xi’an is one ofcapitalin China.

A. older, city

B. the older, city

C. oldest, cities

D. the oldest, cities

答案：

A. older, city

B. the older, city

C. oldest, cities

(答案→)D. the oldest, cities

解析：考查oneof+形容词最高级+复数名词的表达方式，表示“最......之一”。句意“西安是中国最古老的首都之一。”形容词最高级修饰名词，一定要带the，最古老的首都之一，要用cities。