Ravi has been waiting for his sister at the bus stop ________ three o'clock.
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Worked Solution
Step 1: Identify the tense. 'Has been waiting' (Present Perfect Continuous) often pairs with 'since' or 'for'.
Step 2: Look at the time given. 'Three o'clock' is a specific point in time, not a duration.
Step 3: Use 'since' for a specific starting point.
Correct answer: since
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