The sentence refers to a past event ("he found"), and it needs a past perfect continuous tense to describe an action that had already been happening for some time before that past moment.
Choose the correct tense: To his horror, he found that he______for nearly 24 hours.
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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.