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题型：单选题题类：模拟题难易度：普通

Beijing is one of the _______ in the world today.

A、busiest city B、busiest cities C、busy city D、busy cities

举一反三

—Do you know Shanghai is one of in the world?

—Yes, it's bigger than city in China.

Li Yifeng is ______of the three famous stars, and he's ______than the other two.

Many people think China is one of _________ countries in the world.

Shanghai is one of ______________ in China.

Now Shanghai has become one of _____________ cities in the world.

The Mid-Autumn Festival is one of the most t{#blank#}1{#/blank#} festivals among Chinese people.

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