How many fish are there in the pool中为什么要用Are

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• How many fish are there in the pool中为什么要用Are
• we should not spend our money testing so many people,most of _are healthy (whom) 求赐教!句子中的先行词是so many people 它还原到句中做什么成分?我觉得是主语 most of _（so many people) 这个是主语 那为什么还要用whom
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