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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 decreasingD.is decreasing

C

解析试题分析:考查时态和语态。句意:在过去几十年,由于全球的暖化,北冰洋的冰块在不断减少。根据句意及时间状语Over the past decades,可以确定decrease动作从过去就开始了一直持续到现在而且还很有可能持续下去,故使用现在完成进行时,故选C。
考点:考查时态和语态。

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