Step 1: Concept The past continuous tense is required to describe an action that was in progress when another action occurred. It follows the structure: was/were + verb-ing.
Step 2: Meaning The sentence aims to describe two past actions: one finished (the bell ringing) and one that was ongoing at that moment (talking to a friend).
Step 3: Analysis Part 3 ("I talking") is missing the auxiliary verb "was". To be grammatically correct, it must be "I was talking".
Step 4: Conclusion Therefore, the error is in Part 3.
Final Answer: (C)
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Top AP ECET BSc Mathematics Analytical Ability Questions