He is a man of great knowledge,from whom much can be learned这里的much作什么用?
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much是从句的主语 from whom much can be learned是从句 from whom在从句中作状语 can be learned在从句中作谓语 ======以下答案可供参考====== 供参考答案1: It is a noun, used as a subject. 供参考答案2: 这里的much是不定代词 作定从中的主语