past simple or present perfect "preference"

Hello, teachers.

I get puzzled when I read "We prefer ....." when dealing with a grammar point.

In "Swan's Practical English Usage" I found this ...

A. Why are you crying? ---B. My brother HIT me. (Not HAS HIT).

Does this mean that "the present perfect is not O.K.?"

*Does this prefence of one option means that the other options are NOT fine?.


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