关系代词
关系代词有who，whom，whose，that，which，as等，可用作引导从句的关联词。它们在定语从句中可作主语、表语、宾语、定语等;另一方面它们又代表主句中为定语从句所修饰的那个名词或代词(通称为先行词)。
如： He is the man whom you have been looking for. 他就是你要找的那个人
你做过什么最勇敢的事？
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分手后我们还能做朋友吗？
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Back in the day?
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