By the time the bus finally arrived, we ________ at the interchange for more than forty minutes.
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Worked Solution
Step 1: Identify the sequence of events. Both actions happened in the past.
Step 2: The waiting happened *before* the bus arrived and continued up to that point.
Step 3: Use the Past Perfect Continuous tense (had been + verb-ing) to show a continuous action completed before another past action.
Correct answer: had been waiting
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