When she was fifty she retired, her health (impair) ______ by years of overwork.

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问题 When she was fifty she retired, her health (impair) ______ by years of overwork.

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答案having been impaired

解析 本题测试的是独立主格结构的用法。全句的意思是:“当她50岁退休的时候,由于多年超负荷的工作,她的健康受到了损害。”本句中是由“名词+现在分词”构成独立主格结构,在句中作状语,表示补充说明。本句中分词的逻辑主语是her health,根据句意“她的健康受到了损害”,可确定应用现在分词的被动形式 having been impaired。
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