His wrongdoing was completely exposed, but not once he apologised for his actions.
His wrongdoing was completely exposed, but not once he apologised for his actions.
Solution
This question tests inversion after negative adverbials.
When you start a sentence with negative words like "not once," "never," or "rarely," English demands you flip the usual word order—like doing a grammatical backflip! The auxiliary verb jumps in front of the subject. Think of it like "Never have I seen such chaos!" instead of the awkward "Never I have seen such chaos!"
Option 1 → ✓ Perfect inversion: "did" leaps before "he" like a grammatical gymnast.
Option 2 → ✗ Missing inversion after "never"—sounds like broken robot English.
Option 3 → ✗ Good inversion, but forgot "an" before "apology"—almost there!
Option 4 → ✗ No inversion after "not once"—sounds clunky and unnatural.
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