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

解析:

考查时态。句中有Over the past decades谓语动词用现在完成时或现在完成进行时。