1.The existence of oil wells has been known for a long time.为什么用has 而不用have

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1.The existence of oil wells has been known for a long time.为什么用has 而不用have

因为主语是 existence,是个抽象名词,所以谓语动词用 单三 has

因为作主语的是 existence

主语是The existence ,单数,所以用has
of oil wells 只是修饰成分

主语 existence