My son won the first prize in the speech conest last week (改为被动语态)
问题描述：
My son won the first prize in the speech conest last week (改为被动语态)
答
答案：The first prize was won by my son in the speech conest last week.
翻译：上星期我儿子在演讲比赛中夺得了第一名.