Change the following from active to passive:
The panel had been reviewing sensitive proposals when the alarm sounded.

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Accepted Answer

1. **Find object and tense.** Object: "sensitive proposals". Tense: past perfect continuous ("had been reviewing").

2. **Make object the subject.** Put "sensitive proposals" first.

3. **Form passive of past perfect continuous.** Use "had been being" + past participle. So we get "had been being reviewed".

4. **Add the agent and rest of sentence.** Add "by the panel" and "when the alarm sounded".

FINAL_ANSWER: b

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