We use the preposition on when referring to public transport (e.g., on the bus, on the train, on the plane). The phrase means that the phone was left behind inside the bus while traveling
Choose the correct preposition "I forgot my phone______the bus".
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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.