No sooner did the bell ring when the students rushed out of the classroom.
Tripura Public Service Commission - 2026,
Answer: A
The correct form is did the bell ring than: No sooner did the bell ring than the students rushed out.
No sooner is always followed by than, never by when. And because No sooner is a negative adverbial at the front of the clause, it needs inversion: did the bell ring, not the bell rang. The original gets the inversion right but uses when.
The bell rang when fails on both counts. The bell rang than fixes the conjunction but drops the required inversion. The sentence as printed cannot be left unchanged, so No improvement is wrong.
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