Over the past decades, sea ice     in the Arctic as a result of global warming.
A．had decreasedB．decreasedC．has been decreasingD．is decreasing
C。 
考查時(shí)態(tài)。句中有Over the past decades謂語動(dòng)詞用現(xiàn)在完成時(shí)或現(xiàn)在完成進(jìn)行時(shí)。
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