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

发布时间:2020-08-17 11:42:25

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

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A. had decreased
B. decreased
C. has been decreasing
D. is decreasing
解析:考查时态。句中有Over the past decades谓语动词用现在完成时或现在完成进行时。
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