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    18、Corn originated in the New World and thus was not known in Europe until Columbus found it _______ in Cuba.

    A. being cultivated    B. been cultivated      C. having cultivated D. cultivating

    18、A

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    Corn originated in the New World and thus was not known in Europe until Columbus found it _______ in Cuba.

    A. being cultivated    B. been cultivated      C. having cultivated D. cultivating

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