'Not until ...' at the start: inverted auxiliary (was it / did it)

This type of question, asked 2 times: 15 Sep 2025 S1, 21 Sep 2025 S2. All 2 questions below, oldest first.

Try each one first, then open its answer.

Question 1
15 Sep 2025 S1
83 $Select the correct option: Not until the data was independently verified _____ accepted by the journal.$
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Question 2
21 Sep 2025 S2
90 $Select the correct option: Not until the auditors had submitted their exhaustive report ___ the full extent of procedural lapses become evident.$
Tap an option to check your answer.