Choose the option that correctly completes the sentence: 'Rarely _______ such an abrupt drop in atmospheric barometric pressure without an ensuing squall.'
Answer and explanation
Correct answer: B. do meteorologists observe
- Step 1: When a negative or restrictive adverbial (rarely, seldom, scarcely, never) begins a sentence, subject-auxiliary inversion is mandatory.
- Step 2: The auxiliary verb 'do' must precede the subject 'meteorologists', followed by the base verb 'observe'.
Answer
do meteorologists observe.
Why not the others: The other options fail to invert the subject and auxiliary verb after the initial negative adverb 'Rarely'.
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