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

試題分析：句意：北京市當(dāng)今世界最繁忙的城市之一。One of+可數(shù)名詞復(fù)數(shù)表示“……之一”。busiest是busy的最高級(jí)，前要用定冠詞the。故選B。
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