The correct preposition is “for” → “Our public libraries are open for general reading purposes.” Here, for indicates the intended purpose or use.
Our public libraries are open ______ general reading purposes.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the SIBA Testing Service (STS) preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.