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