Hardly ______ the building when the alarm sounded.

Answer and explanation

Correct answer: B. had they entered

  1. Step 1: 'Hardly ... when' links two past events, and the negative adverb leads to inversion. Step 2. The first event takes the past perfect: 'had they entered'. Answer: had they entered. Why not the others: these keep the normal order or use a wrong form.

Practise more Grammar in Context (Set 2).

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