）Over the past decades,sea ice in the Arctic as a result of global warming.）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 解释一下

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）Over the past decades,sea ice in the Arctic as a result of global warming.）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 解释一下
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）Over the past decades,sea ice in the Arctic as a result of global warming.）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 解释一下
）Over the past decades,sea ice in the Arctic as a result of global warming.
）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 解释一下您为什么选  

）Over the past decades,sea ice in the Arctic as a result of global warming.）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 解释一下
选择c 因为c表示现有状态,并且会一直持续下去.

C
Over the past decades 在过去的数十年间表示现在完成时态
因为冰川仍在消失中，所以用过去完成进行时态

over the past是什么意思 over the past centuries over the past century意思 LOOKING BACK OVER THE PAST是什么意思 over the past ten years是什么意思 over the past year.这儿的 over the past centuries汉语意思 In study after study over the past Several times over the past decades over the past ten 为什么over可以用在这里? I can not forget the Over the past memory of the changes in Beijing over the past 100 为什么是in the past three years而不是over the past three years over the past twenty years 还是in the past twenty years in the past two years和over the past two years有什么区别? during the past 20 years 和 over the past 20 years一样吗? in the past 3 years 和 over the past 3 years的区别 over the past 12 months 和 at the past 12 months 有什么区别?