I t is one of the _______ international ...

I t is one of the _______ international airlines.

A．busy

B．busier

C．busiest

D．most busy

C 【解析】此题考查固定短语结构one of the+形容词的最高级+名词的复数形式，表示最…其中之一，而busy的最高级是busiest，故选C。

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