Sentence Correction (SC) | Although some had accused Smith, the firms network manager, of neglig

GMATNinja

Thank you for your reply! An expert above mentioned the following:

Mandy passed an exam that was quite difficult. --> OK
Mandy passed a quite difficult exam. --> WRONG

I do not understand why "Mandy passed a quite difficult exam" is incorrect. "Difficult" modifies "exam" and "quite" modifies "difficult". Thank you again.
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