54．Finally.they have built in the center of the city． A．all twenty-floors building B．a t——青夏教育精英家教网—

摘要：54．Finally.they have built in the center of the city． A．all twenty-floors building B．a twenty-floor building C．an twenty-floor building

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Finally，they have built in the center of the city．

A．all twenty—floors building

B．a twenty—floor building

C．an twenty—floor building

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