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定语从句分为限制性和非限制性两种。本文仅分析由which引导的非限制性定语从句中which用法,即which代表主句中的那一部分,which在从句中的句法功能。一、which代表主句中的名词1.代表主句中做主语的名词Smallpox, which once killed thousands ofpeople every year,has now been wiped out.