Fill in the blank with the correct inversion structure:
No sooner had he entered the room __________ the fire alarm werns off.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is Option 2 i.e. than.
Grammatical Concept/Meaning:
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Correlative Conjunctions: Certain words in English work in pairs. The phrase "No sooner" is always paired with the conjunction "than."
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The Inversion Rule: When a sentence begins with a negative expression like "No sooner," "Hardly," or "Scarcely," the auxiliary verb must precede the subject.
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Tense Correlation: Usually, the "No sooner" clause is in the Past Perfect (had + V3), and the "than" clause is in the Simple Past (V2)
Correction/Reasoning:
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Than: This is the only grammatically correct partner for "No sooner." It introduces the second event in the sequence.
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Common Errors: Students often incorrectly use "when" or "then." However, "when" is paired with "Hardly" or "Scarcely," and "then" is never used in this specific correlative structure.
Final Sentence: No sooner had he entered the room than the fire alarm went off.
Hence, the chosen option is correct.