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thereasonwhyhedoesntcometoschoolisnotclear.为啥有了reason还要用why呢?

题目详情
the reason why he doesnt come to school is not clear. 为啥有了reason 还要用why呢?
▼优质解答
答案和解析
why 是引导一个从句
就好像:
the person who is my brother is there
这里有了person ,为什么还有一个who?
意思是一样的,是为了引导后面的从句.
祝好.