UPSC CDS 1 2022 English Paper

The correct answer is 'than the flight took off.'
Key Points
- No sooner is used to show that one thing happens immediately after another thing.
- It is often used with the past perfect and usually followed by than.
- Example: They had no sooner arrived than they were arguing.
- Hence, 'than the flight took off' should be used to make the sentence grammatically correct.
- Correct Sentence: No sooner did I arrive at the airport than the flight took off.