问题
选择题
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
答案
答案：B
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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
答案：B