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    30．Over the past decades, sea ice is decreasing in the Arctic global warming. A．as a result of B．on top of C．in front of D．in need of 【查看更多】

     

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    Over the past decades, sea ice is decreasing in the Arctic       global warming.

             A．as a result of      B．on top of    C．in front of  D．in need of

     

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    Over the past decades, sea ice is decreasing in the Arctic       global warming.

           A．as a result of    B．on top of  C．in front of D．in need of

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    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

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    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

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

    A．had decreasedB．decreasedC．has been decreasingD．is decreasing

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