Identify the option that provides the correct syntax for the correlative construction:

Not only ________ rigorous statistical cross-validation, but it also resolved earlier anomalies in the experimental telemetry.

Answer and explanation

Correct answer: B. did the novel algorithmic model provide

Answer: did the novel algorithmic model provide. Why not the others: 'the novel algorithmic model provided' fails to invert the auxiliary and subject after fronted 'Not only'; 'had provided the novel algorithmic model' inverts the full verb group incorrectly; 'provided the novel algorithmic model' performs full lexical verb inversion rather than auxiliary fronting.
  1. Step 1: Analyze the opening coordinating adverbial: 'Not only' placed at the beginning of a clause requires subject-auxiliary inversion in the initial coordinating clause.
  2. Step 2: Construct the inversion for simple past tense: use the dummy auxiliary 'did' followed by the subject 'the novel algorithmic model' and the base verb 'provide'.

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