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题目
题型:不详难度:来源:
Over the past decades, sea ice     in the Arctic as a result of global warming.
A.had decreasedB.decreasedC.has been decreasingD.is decreasing

答案
C。 
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。
核心考点
试题【Over the past decades, sea ice     in the Arctic as a result of global warming.A】;主要考察你对一般现在时等知识点的理解。[详细]
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