Two years ago we used that machine to make shoes for children.(改为被动语态)下面是Two years ago that machine ————shoes forchildren.

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Two years ago we used that machine to make shoes for children.(改为被动语态)
下面是Two years ago that machine ————shoes for
children.

Two years ago that machine (was used to make)shoes for
children
改被动就是把主动的do 改成 be done ,再加上时态
所以 used 就改为 be used