Over the past decades, sea ice _____ in the Arctic as a result of global warming. [ ]A. had decreased B. decreasedC. has been decreasing D. is decreasing -高中英语-魔方格

◎ 题干

Over the past decades, sea ice _____ in the Arctic as a result of global warming.

A. had decreased
B. decreased
C. has been decreasing
D. is decreasing

◎ 答案

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◎ 解析

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◎ 知识点

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