this kind of machine was using many years ago 找出错误一项并改正

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thiskindofmachinewasusingmanyyearsago找出错误一项并改正thiskindofmachinewasusingmanyyearsago找出错误一项并改正thiskind

this kind of machine was using many years ago 找出错误一项并改正
this kind of machine was using many years ago 找出错误一项并改正

this kind of machine was using many years ago 找出错误一项并改正
using 改used

using 改为 used. 机器被用,被动态用过去分词,used.

希望满意,祝您进步:)

using 改used
机器是被使用,所以用被动语态,be+pp,pp是过去分词

was used