Select the correct completion:
'Hardly [...] into the orbital trajectory when the telemetry system detected a micro-meteoroid collision.'
Answer and explanation
Correct answer: B. had the communication satellite entered
- Step 1: Negative adverbial 'Hardly' at the front of a sentence requires subject-auxiliary inversion with past perfect: 'Hardly had [subject] [past participle]... when...'. Step 2. Correct form: 'had the communication satellite entered'. Answer: had the communication satellite entered. Why not the others: Inversion with past perfect is required; uninverted forms are ungrammatical.
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