Select the sentence that uses the past perfect tense appropriately.

Answer and explanation

Correct answer: C. When the firefighters arrived, the residents had already extinguished the kitchen blaze.

  1. Step 1: The past perfect ('had extinguished') designates an action completed before another past event ('arrived'). Step 2. 'Had already extinguished' correctly shows the fire was out prior to the arrival. Answer: When the firefighters arrived, the residents had already extinguished the kitchen blaze. Why not the others: Simple past 'extinguished' lacks relative chronological sequence; 'have extinguished' mixes present perfect with past reference.

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