The correct preposition after “fed up” is “with.” The expression “fed up with” means tired, annoyed, or frustrated because of something that has continued for too long. Therefore, “I am fed up with his mess” is grammatically correct.
I am fed up ______ his mess.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the PPSC Punjab Public Service Commission preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.