CornoriginatedintheNewWorldandthuswasnotknowninEuropeun...

问题详情：

Corn originated in the New World and thus was not known in Europe until Columbus found it _______ in <?xml:namespace prefix = st1 />Cuba.

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

【回答】

知识点：现在进行时及其被动式

题型：选择题