Every boy and every girl in English has read the book为什么用has

Every boy and every girl in English has read the book为什么用has 快,马上采纳,在线等!
我知道这个句子很中国化,应该是every boy and girl has/have read the book可是假设题目就是这样,为什么用has呢?every boy和every girl不就是两个了么 用and连结用复数了?还有,后面那个句子（every boy and girl has/have read the book）该用have还是has呢谢谢!