Choose the sentence that correctly uses an inverted sentence structure for rhetorical emphasis.
Answer and explanation
Correct answer: A. Seldom have we observed such remarkable scientific cooperation across borders.
- Step 1: When a negative or restrictive adverbial (like 'seldom', 'rarely', 'scarcely') introduces a clause, subject-auxiliary inversion is mandatory. Step 2. The auxiliary verb 'have' precedes the subject 'we': 'Seldom have we observed...'. Answer: Seldom have we observed such remarkable scientific cooperation across borders. Why not the others: Standard word order without inversion ('we have') violates inversion rules; 'did we observed' incorrectly pairs auxiliary did with past tense observed.
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