第33题: [单项选择]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. having cultivated D. cultivating 参考答案:A 答案解析:[译文]玉米源于新大陆;直到哥伦布在古巴发现它被种植,才被欧洲人知道。
[题解]时态与语态:从句意看,玉米应是被种植,故此,排除[C]、[D]两项;而[B]中,been cultivated这种用法