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问一下OG上一个题.The distribution,if not the sale,of newspapers was

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问一下OG上一个题.The distribution,if not the sale,of newspapers was assisted by the establishment of a postal service in1710,which had a network of some 65 offices by 1770,serving all 13 colonies……这个句子里的which代指什么?为什么?
问一下OG上一个题.The distribution,if not the sale,of newspapers was
which 指代逗号前“a postal service in 1710”,引导的非限定定语从句
译文:报纸的分发(而不是销售)得到了在1710年建立的邮局的帮助,该邮局到1770年的时候已经形成拥有65个办公室,遍及所有的13个殖民州.