Pudong International Airport is one of airports in the world.A. bigB. biggerC. the biggerD

问题补充：

Pudong International Airport is one of airports in the world.

A. big

B. bigger

C. the bigger

D. the biggest

答案：

A. big

B. bigger

C. the bigger

(答案→)D. the biggest

解析：句意：浦东国际机场是世界上最大的机场之一。one of +the +形容词的最高级+名词的复数+范围，“最…之一”的固定句型。故选D