Question

No sooner _______________ than the burglars fled.

Answer 1

Answer:

Both are grammatically correct: use of past perfect is not necessary because the no sooner... than construct defines the order. This NGRAM indicates that both are common, and that the past perfect form is preferred. No sooner had I closed my eyes than I fell asleep. No sooner did I close my eyes than I fell asleep.

Explanation:

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