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