It isn't what you know that matters,but who you know. 请问what you know是表语从句，还是that matters是表语从句？抑或是 that matters是表语从句，what you know 为定语从句修饰名词matters？
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what you know
It isn't what you know that matters,but who you know. 请问what you know是表语从句，还是that matters是表语从句？抑或是 that matters是表语从句，what you know 为定语从句修饰名词matters？
what you know