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Who told you that ....

Why does this kind of question not need "do"

Who did tell you that ...

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Because the pronoun "who" is replacing the subject of the sentence, not the object.

Compare

What eats mice? (answer Cats eat mice)

What do mice eat? (answer Mice eat seeds and nuts)

With "what" questions, the first type is fairly rare, but it is common enough with "who" questions.

Who told Mary? (answer John told Mary)

Who did Mary tell? (answer Mary told John)

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  • Perfect answer. Appologize again for accepting an answer in a short time. – Zhang Apr 19 '19 at 8:09

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