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    12、Dinosaurs have completely died out on the earth，never _______ again．

    A．to be seen                                 B．being seen

    C．seen                                                  D．having been seen

    12、A

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    Dinosaurs have completely died out on the earth，never _______ again．

    A．to be seen                                 B．being seen

    C．seen                                                  D．having been seen

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