In the past decades, sea ice ____ in the Arctic as a result of global warming.[ ]A. had meltedB. has been meltingC. meltedD. is melting-高中英语-魔方格

◎ 题干

In the past decades, sea ice ____ in the Arctic as a result of global warming.

[ ]

A. had melted
B. has been melting
C. melted
D. is melting

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◎ 解析

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◎ 知识点

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