Beijing the capital of China is one of cities in the world.A. the biggestB. biggerC. bi

问题补充：

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

A. the biggest

B. bigger

C. biggest

D. big

答案：

(答案→)A. the biggest

B. bigger

C. biggest

D. big

解析：句意：北京，中国的首都，是世界上最大的城市之一。这里没有比较的对象，故用最高级，且前面需要加定冠词the。