He was having a difficult time, but never once he complained.
Solution
✅ Correct Option: 1
This question tests negative adverbial inversion. When you start with negative expressions like "not once," "never," or "rarely," English gets fancy and flips the subject and auxiliary verb—just like asking a question! It's like the sentence is so dramatic, it needs special word order. Example: "Not once did she forget her keys" (not "Not once she forgot her keys"). Option 1 → Correct! Uses proper inversion: "did he complain" sounds natural. Option 2 → Wrong phrase choice—"give the complaint" sounds like handing over paperwork. Option 3 → No inversion plus awkward phrasing makes this a mess. Option 4 → Missing the required inversion—sounds like broken English grammar.
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