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To fetch water before breakfast seemed to him a rule never _____(break).为什么横线上要用to be break

题目详情
To fetch water before breakfast seemed to him a rule never _____(break).
为什么横线上要用to be break
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答案和解析
啊,应该是to be broken吧,永远不被打破的规定习惯,被动语态