Choose the option that correctly completes the sentence: 'Hardly had the aircraft touched down on the tarmac _____ a dense blanket of Harmattan dust enveloped the airport.'

Answer and explanation

Correct answer: C. the word 'when'

  1. Step 1: Correlative conjunction pair: 'Hardly... when'. Step 2. Inverted sentence beginning with 'Hardly had...' pairs obligatorily with 'when'. Answer: when. Why not the others: 'than' pairs with 'no sooner'; 'then' and 'before' violate the correlative rule.

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