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

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

出自：石家庄铁道大学-大学英语二

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