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In the past few years, sea ice ____ in the Arctic as a result of global warming.
A．had meltedB．has been melting C．meltedD．is melting
B
考查時態(tài)。根據(jù)in the past few years可知是與完成時連用的，在根據(jù)句意是指海冰一直都在融化。所以使用現(xiàn)在完成進行時。句意：在過去幾年里，因為全球變暖，海冰一直在融化。
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