thestudentwhosegradesimprove为什么不用who

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who 与whose的区别如下：who 代表人,在从句中作主语; whose表示“某人的”,在从句中作定语.例如以下两个句子：The man who robbed her has been arrested. 抢她东西的人被捕了.A mental patient is one whose mind is diseased. 精神病人就是脑子有病的人.