牛津译林 模块六第二单元 M6U2 Grammar and usage语法
5.分词完成式的两种语态：主动语态 having done;被动语态having been done。 Having been trapped in traffic, he was late for work. 6.分词的否定式的构成: not +分词。 Not having received a reply, he decided to write again. Not repaired well, the washing machine stopped working again.