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    15、The reason why the dinosaurs died out remains unknown. They ______ by an enormous volcanic eruption.

    A. would have killed                    B. might have been killed

    C. should have been killed            D. must have killed

    15、B

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    The reason why the dinosaurs died out remains unknown. They ______ by an enormous volcanic eruption.

    A. would have killed                    B. might have been killed

    C. should have been killed            D. must have killed

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