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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