Over the past decades, sea ice in the Arctic as a result of global warming.
A. had decreased
B. more than
C. attach
D. apply
网友回答
A. had decreased
B. more than
(答案→)C. attach
D. apply
解析：考查动词时态。从over the past decades可知, 在英语中over /in the past /last + 时间段要与现在完成时连用，选C。