Choose the option that correctly completes the sentence:
'Not until the diplomatic delegation arrived at the summit [...] the formal treaty negotiations.'
Answer and explanation
Correct answer: A. did the plenary council begin
- Step 1: Negative adverbial clauses beginning with 'Not until...' at the head of a sentence trigger subject-auxiliary inversion in the main clause. Step 2. Correct inverted past simple form: 'did the plenary council begin'. Answer: did the plenary council begin. Why not the others: Standard word order without inversion is ungrammatical following introductory 'Not until'.
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