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 Overthepastdecades,seaice

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問題詳情:

 Overthepastdecades,seaice

 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

【回答】

C

知識點:現在完成進行時及其被動式

題型:選擇題