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    18、

    Over the past decades, sea ice     in the Arctic as a result of global warming.

    A. had decreased  B. decreased   C. has been decreasing D. is decreasing

       

     

    18、C。 ks5u

    解析：考查时态。句中有Over the past decades谓语动词用现在完成时或现在完成进行时。 ks5u

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