Which option correctly uses an inversion construction after a negative conditional?
Answer and explanation
Correct answer: D. Under no circumstances should laboratory personnel operate the autoclave without protective gear.
- Step 1: Prepositional phrases with negative force ('Under no circumstances') at the beginning of a sentence require subject-modal inversion: 'should [subject] [verb]'. Step 2. Correct structure: 'should laboratory personnel operate'. Answer: Under no circumstances should laboratory personnel operate the autoclave without protective gear. Why not the others: The modal auxiliary 'should' must precede the subject.
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