一道高考题being bitten twice ,the postman refused to diliver our

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一道高考题
being bitten twice ,the postman refused to diliver our letter unless we chained our dog.为什么being bitten.而不是having been bitten?

本来是两句话,改为状语之后合并了.主句是过去式,状语还原为句子,应该是since he was bitten twice,the postman refused to diliver our letter unless we chained our dog. 这样子,才能体现主从句的时态一致性.如果使用了having been bitten,你试着还原回去,从句时完成时态,而主句是过去式,不太对称啊!~

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