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    We can’t figure out why quite a number of insects, birds, and animals are . A. dying out B. dying away C. dying down D. dying off 【查看更多】

     

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    We can’t figure out why quite a number of insects, birds, and animals are_____.

    　 A. dying out　　　 B. dying away　　　 C. dying down　 D. dying off

     

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    We can't figure out ________ quite a number of insects,birds and animals are dying out．

    [　　]

    A．that

    B．as

    C．why

    D．when

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