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    As a UN report warns, animals at a speed 100 times faster now than any time in the past since the dinosaurs were wiped out. A .are dying out B. have died out C. were dying out D. had died out 【查看更多】

     

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    As a UN report warns, animals ________ at a speed 100 times faster now than any time in the past since the dinosaurs were wiped out．

    [　　]

    A．are dying out

    B．have died out

    C．were dying out

    D．had died out

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