Nanjing is one of in China.A. beautiful cityB. more beautiful cityC. the most beautiful c

问题补充：

Nanjing is one of in China.

A. beautiful city

B. more beautiful city

C. the most beautiful city

D. the most beautiful cities

答案：

A. beautiful city

B. more beautiful city

C. the most beautiful city

(答案→)D. the most beautiful cities

解析：句意：南京是中国最美丽城市之一。形容词的最高级most前要加定冠词the；而在表达“…… 之一”时，后面的名词要用复数形式；故选D。