题目内容

Beijing is one of the _______ in the world today.
A．busiest cityB．busiest citiesC．busy cityD．busy cities
B

试题分析：句意：北京市当今世界最繁忙的城市之一。One of+可数名词复数表示“……之一”。busiest是busy的最高级，前要用定冠词the。故选B。
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