Over the past decades sea ice in the Arctic as a result of global warming.A. had decreas

问题补充：

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

答案：

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。