Three fifths of the workers in our factory___(已经受过训练)in that technical and engineering school给出的词(train)详解 -
问题描述：
Three fifths of the workers in our factory___(已经受过训练)in that technical and engineering school
给出的词(train)详解 -
答
“已经受过训练” 应该用完成时的被动语态
主语是五分之三的工人，复数
所以 have been trained
答
Three fifths of the workers in our factory_have been trained__(已经受过训练)in that technical and engineering school
答
workers是主语,动词用复数
已经受过训练)表示要用have done的形式
工人是被训练的,所以要用被动形式
综上,答案是have been trained
Ps 如果有过去时间出现要考虑had done 形式