In the past decades, sea ice ______ in the Arctic as a result of global warming.
题型:不详难度:来源:
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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答案
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。 点评:英语中的时态主要由动词的形式决定,因此在学习英语时态时,要注意分析动词形式及具体语境,想象在那个特定的时间动作所发生的背景,这个动作是经常性动作、一般性动作、进行性动作、完成性动作还是将要发生的动作。 |
举一反三
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