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    Stop killing this kind of birds! They . A.are dying out B.are dying down C.have died out D.have died off 【查看更多】

     

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    Stop killing this kind of birds! They  _______.

    [     ]

    A. are dying out
    B. are dying down
    C. have died out
    D. have died off

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    Stop killing this kind of birds! They _______.

    A.are dying out                B.are dying down      C.have died out           D.have died off

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