问题
选择题
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
答案：C
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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：C