Choose the option that correctly uses an inversion after 'Scarcely':

Answer and explanation

Correct answer: C. Scarcely had the rocket cleared the launchpad when telemetry signals were lost.

  1. Step 1: Initial restrictive adverb 'Scarcely' requires subject-auxiliary inversion ('had + subject + past participle') paired correlatively with 'when'.
  2. Step 2: 'Scarcely had the rocket cleared... when' adheres strictly to inverted syntax and standard correlative conjunction rules.
Answer
Scarcely had the rocket cleared the launchpad when telemetry signals were lost.
Why not the others: Sentence 2 lacks inversion; Sentence 3 pairs 'scarcely' with 'than' (only 'no sooner' takes 'than'); Sentence 4 pairs 'did' with the past participle 'cleared'.

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