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Over the past decades, sea ice _____ in ...

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

A. had decreased    B. more than            C. attach               D. apply

 

C 【解析】考查动词时态。从"over the past decades"可知, 在英语中"over /in the past /last + 时间段"要与"现在完成时"连用,选C。
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