Inthelast20years,seaice         intheArcticbecauseofglo...

问题详情：

In the last 20 years, sea ice          in the Arctic because of global warming.

A. had decreased

B. decreased    

C. has been decreasing

D. is decreasing

【回答】

C

知识点：动词时态与语态

题型：选择题