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    28．Rooftops with plants, called “green roofs , could help fight global warming. A．to cover B．being covered C．covered D．covering 【查看更多】

     

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    Rooftops 　　　 with plants, called “green roofs”, could help fight global warming.

    　 A．to cover　　 B．being covered　　　　　　　 C．covered　　 D．covering

     

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