The action of "walking" is a single event that interrupts the ongoing action of watching TV. When using past continuous in the first part of the sentence, the second action (usually a shorter, completed action) should be in the simple past tense, so "walked" is the
I was watching a TV program, when he ______ in.
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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.