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In the past decades, sea ice ______ in t...

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

 

B 【解析】 试题分析:考察时态。本题的关键是前面的时间状语In the past decades。只要出现“in the past/last+一段时间”,都要和现在完成时连用。句意:在过去的几十年里,由于全球变暖,北极的海冰一直都在融化。B项的现在完成进行时表示从过去开始一直延续到现在的情况。这一情况符合题意。 考点:考察时态
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