2. 外语
  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、having cultivated
C、has been cultivated
D、cultivating
答案A
解析 首先，是人们cultivate“种植”玉米，也就是说corn是被cultivated的，因此用主动形式是错误的，据此排除B和D。其次，cultivate在本句中是作found的宾语补足语，如果found后面接从句的话，时态应该是过去时it was cultivated in Cuba。所以只有A符合语法要求。
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