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1、区别一:which是关系代词或关系形容词,作为代词用作主语或宾语,作为形容词用作定语;“介词短语+ which”属于副词性,只能用作状语.如:This is my house, (which) is small and old. 这是我的房子,它又小又旧.[主语]He is studying economics, (which subject) is very important. 他正在学习经济学, 该学科是很重要的.[定语]This is the subject (on which) she spoke. 这就是她谈到的话题. [状语]区别二:which 用于定语从句,作关系代词,在句中要做成分in which 用于定语从句。
2、作关系副词,在句中不做成分,in which=where。
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