___he does not know the answera teacher as mr.smith is teacher as mr.smith is why?

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___he does not know the answera teacher as mr.smith is teacher as mr.smith is why?
___he does not know the answer
a teacher as mr.smith is teacher as mr.smith is
why?

___he does not know the answera teacher as mr.smith is teacher as mr.smith is why?
不加a.固定用法,职业前不加a

teacher as mr.smith is

像smith这样的老师
突出的是他的职业,所以不加a