The correct preposition with "good" in this context is "at". → "He is good at playing the piano" is grammatically correct.
He is good _____ playing the piano.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the SPSC – Sindh 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.