Over the past decades, sea ice______in the Arctic as a result of global warming.

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问题 Over the past decades, sea ice______in the Arctic as a result of global warming.

选项 A、had decreased
B、decreased
C、has been decreasing
D、is decreasing

答案C

解析 句意:在过去的几十年里,由于全球变暖,北极的冰川在不断地融化。“冰川融化”是个一直持续到现在并且会继续下去的动作,要用现在完成进行时表示。因此,C项为正确答案。
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