Industrial buyers are responsible for supplying the goods and services that an organization required for its operations.
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【正确答案】 1、正确答案:required—requires    
【答案解析】解析:考查时态。由are可看出本句的基本时态是现在时,讲述的是一般性的事实。故此处不宜用过去时,由于主语an organization是单数形式,应将required改为requires。