Most of my knowledge has been acquired from books.中应该用has还是have?为什么?Most of my knowledge has been acquired from books.应该用has还是have?为什么呢?

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Most of my knowledge has been acquired from books.中应该用has还是have?为什么?
Most of my knowledge has been acquired from books.应该用has还是have?为什么呢?

has
主语是knowledge,不可数名词,用单数.