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

Over the past decades, sea ice 　 in the Arctic as a result of global warming.

A. had decreased B. decreased C. has been decreasing　 D. is decreasing

试题答案

C

考查动词时态。句意：在过去的几十年里，海中的冰由于全球气候变暖一直在减少。