The correct sentence uses the base form of the verb after “did not”: not write a letter. This follows the English rule: “did + not + base verb” for negative past tense sentences.
He did not _________ a letter.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the ASF Airports Security Force preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.