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20. 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
(责任编辑：admin) |
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20. 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
(责任编辑：admin) |