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Corn originated in the New World and thus was not known in E

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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
这题选B表被动,为什么 请翻译
Corn originated in the New World and thus was not known in E
A（正在被,所以是被动语态,过去进行时）
在古巴被发现被种植
玉米起源于新的世界,从而在欧洲不为人知,直到哥伦布在古巴发现它（被种植）
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