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

此題考查動(dòng)詞時(shí)態(tài)，由句中的時(shí)間狀語從句“over the past decades”，可知句子的謂語動(dòng)詞要用現(xiàn)在完成時(shí)或現(xiàn)在完成進(jìn)行時(shí)態(tài)。
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