这可以是一个名词性从句作主语或宾语（what）,也可以是形容词性的定语从句（which）,前面的先行词（被修饰的名词）应该在定语从句里作宾语.
what 或 which 是关系代词,其引导从句的功能（从句引导词）.
What/which they did for others.中文what which在这里起什么作用
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