“She” or “her” following “no one but”?

Which pronoun is correct in the following sentence?

No one but her/she ever made a perfect score on the test

The answer according to the book is “her”, but it is getting on my nerves.
I tried solving it by making a different statement as follows:

She made a perfect score on the test

Why does using “No one but” change it to accusative case?


But is here a preposition and when a pronoun follows a preposition it is in the accusative case. If you substitute except for but, which more or less has the same meaning, you will see that it has to be her.

Source : Link , Question Author : Kartik Anand , Answer Author : Barrie England

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