By the time the ambulance arrived, the brave passerby ________ first aid to the injured cyclist for ten minutes.
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Worked Solution
Step 1: Observe the sequence of past events (ambulance arrival vs. first aid).
Step 2: Note the duration ('for ten minutes').
Step 3: Use Past Perfect Continuous ('had been administering') to show an ongoing action that happened before another past event.
Correct answer: had been administering
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