Not until the results were published ____ the extent of the error.
Answer and explanation
Correct answer: C. did the team realise
- Step 1: A sentence that begins with a negative adverbial such as 'Not until...' requires inversion in the main clause. Step 2. Inversion with a simple past verb uses did + subject + base verb. Answer: did the team realise. Why not the others: 'the team realised' keeps normal word order; 'had the team realised' wrongly shifts to the past perfect; 'the team did realise' puts did after the subject.
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