Identify the sentence that correctly employs the past perfect continuous tense?

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Identify the sentence that correctly employs the past perfect continuous tense? Answer: She had been reading the book for two hours when I called

This sentence correctly uses the past perfect continuous tense, which is used to describe an action that started in the past, continued for some time, and was completed before another past event.

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.