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:过去几十年来(隐含至今),北冰洋的冰层一直在减少,选C。
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