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    Dinosaurs have been extinct from the earth, never again. A. seen B. being seen C. to be seen D. having been seen 【查看更多】

     

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    Dinosaurs have been extinct from the earth, never ____________ again.
        A. seen         B. being seen        C. to be seen       D. having been seen

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    Dinosaurs have been extinct from the earth, never ____________ again.
    A. seen         B. being seen        C. to be seen       D. having been seen

     

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    Dinosaurs have been extinct from the earth, never ________ again．

    [　　]

    A．seen

    B．being seen

    C．to be seen

    D．having been seen

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