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    12、Until tens of years ago，most zoos _____ in such a way—animals in one area and birds in another．

    A．were organized           B．had organized     C．will organize      D．have been organized

    12、A

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    Until tens of years ago，most zoos _____ in such a way—animals in one area and birds in another．

    A．were organized           B．had organized     C．will organize      D．have been organized

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