6) 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)shavingscultivated D) cultivating

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选 A being cultivated corn 玉米谷类 是 被 耕种。需要用表示被动含义的结构。C(having cultivated) D 均不表示被动。不可选。B been cultivated 本身不符合语法结构。英语中没有 find sth been + ed分词 的表达。A being cultivated 是正确的结构与表达。