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    Over the past decades , sea ice          in the Arctic as a result of global warming .
    A．had decreasedB．decreased C．has been decreasing D．is decreasing .
     D

    此题考查动词时态，由句中的时间状语从句“over the past decades”，可知句子的谓语动词要用现在完成时或现在完成进行时态。
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