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31．Cars produce a lot of waste gas every day and pollute the air , air pollution has become a serious problem．A．As a result B．In the way C．No longer D．At the end 【查看更多】

 

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Cars produce a lot of waste gas every day and pollute the air        , air pollution has become a serious problem．

A．As a result            B．In the way         C．No longer             D．At the end

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