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题目内容
（石家庄铁道大学-大学英语二）
Over the past decades, sea ice in the Arctic(北极) as a result of global warming.
A、 had decreased
B、 will decrease
C、 has been decreasing
D、 is decreasing
A、 had decreased
B、 will decrease
C、 has been decreasing
D、 is decreasing
参考答案