Corn was not known in Europe until Columbus______(发现玉米被种植) in Cuba.

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问题 Corn was not known in Europe until Columbus______(发现玉米被种植) in Cuba.

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答案found it being cultivated

解析 “玉米被种植”用the corn was cultivated表达。“发现”用find表达,常采用find sth.doing的形式。此处是被动,所以要用现在分词的被动式being cultivated。为避免词汇的重复,此处the com可由it指代。最后判断此处的时态,从was,until可推断出此处的谓语动词为一般过去时,故答案为found it being cultivated。
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