The preposition "with" is used here to show the cause or reason for trembling. It connects the action (trembling) to the cause (cold).
My brother was trembling ____ cold.
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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.