Inthelast20years,seaice         intheArcticbecauseofglo...

問題詳情：

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

知識點：動詞時態與語態

題型：選擇題