@tayconlinh075: Grammar Explanation This sentence uses Inversion. When a negative or restrictive adverb comes at the beginning of a sentence, we invert the subject and auxiliary verb. Common IELTS words: Rarely Never Seldom Hardly Little No sooner ✔ Structure: Negative Adverb + Auxiliary + Subject + Verb Example: Never have I seen such beauty. Rarely do students understand this rule. Why are the other answers wrong? ❌ A. I have seen No inversion. ❌ C. I saw Wrong tense and no inversion. ❌ D. did I seen After "did", we must use the base form. Correct: did I see Vocabulary Explanation rarely (adv) = not often Synonyms: seldom infrequently Example: I rarely watch television.