Beijing the capital of China is one of cities in the world.A. the biggest B. biggerC. mu

问题补充：

Beijing ,the capital of China, is one of cities in the world.

A. the biggest

B. bigger

C. much bigger

D. big

答案：

(答案→)A. the biggest

B. bigger

C. much bigger

D. big

解析：根据one of后面往往跟最高级，表示“最…之一”，故本题应用the biggest。本句的意思是“北京，中国的首都，是世界上最大的城市之一。”所以本题选A。