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

来源:学生作业帮助网 编辑:作业帮 时间:2024/06/05 08:12:40

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