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[单选题]
Over the past decades, sea ice _____ in the Arctic as a result of global warming.(1分)
A
had decreased
B
decreased
C
has been decreasing
D
is decreasing
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试题答案：
C
答案解释：
解题思路： 题干中的时间状语 “over the past decades” 意为“在过去的几十年来”，表明句中的动作 decrease 是从过去某时开始的动作一直延续到说话时还在继续进行,并有可能延续下去的动作，符合现在完成进行时的用法，故正确答案为C。
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