Wearing school uniforms has both advantages and disadvantages 为什么这里用has不是have

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Wearing school uniforms has both advantages and disadvantages 为什么这里用has不是have

Wearing school uniforms has both advantages and disadvantages 为什么这里用has不是have
Wearing school uniforms has both advantages and disadvantages 为什么这里用has不是have

Wearing school uniforms has both advantages and disadvantages 为什么这里用has不是have
因为前面是wearing school uniforms 是动名词 谓语动词要用单数形式 所以用has