No sooner ---- the rocket cleared the launch tower than telemetry engineers ---- an anomalous vibration in the booster.
Answer and explanation
Correct answer: C. had / detected
- Step 1: The correlative negative temporal construction 'No sooner had + subject + past participle ... than + past simple' requires inversion and past perfect.
- Step 2: 'No sooner had the rocket cleared ... than engineers detected'.
Answer
had / detected.
Why not the others: 'did / have detected' violates the standard 'no sooner had ... than' idiom; 'has / were detecting' mixes present and continuous; 'would' is modal.
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