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高一英语一题……关于punishSincehewasonlyaboy,thepolicemanhadtolethimleave,unpunished.为什么不用beingunpunished?

题目详情
高一英语一题……关于punish
Since he was only a boy,the policeman had to let him leave,unpunished.
为什么不用being unpunished?
▼优质解答
答案和解析
过去分词,做状语,表示结果,做状语通常不用be的形式
做状语一般都用doing和done