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为什么不能用which?不是非限制性定语从句吗?用which引导的located做过去分词.新手上路指点下policemenusetelephones,locatedthroughouttheirdistrict,tomakeimmediatecontactwithheadquartersAconvincinglyBconvenien

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为什么不能用which?不是非限制性定语从句吗?用which引导的located做过去分词.新手上路指点下
policemen use telephones,___located throughout their district,to make immediate contact with headquarters
A convincingly B conveniently C that D which
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答案和解析
用which需要加which are located