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

1、B

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

A．a(chǎn)ll twenty—floors building

B．a(chǎn) twenty—floor building

C．a(chǎn)n twenty—floor building

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