2. 专升本
  3. Corn originated in the New World and thus was not known in Europe until Columbus found it______ in Cuba.

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

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问题 Corn originated in the New World and thus was not known in Europe until Columbus found it______ in Cuba.
选项 A、being cultivated
B、been cultivated
C、having cultivated
D、cultivating
答案A
解析
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