Choose the correct passive voice: "Someone had stolen the artwork before the alarm went off."
- A. The artwork had being stolen before the alarm went off.
- B. The artwork was stolen before the alarm went off.
- C. The artwork had been stolen before the alarm went off. ✓
- D. The artwork has been stolen before the alarm went off.
Correct answer
C. The artwork had been stolen before the alarm went off.
Explanation
Past perfect active becomes past perfect passive: 'had been stolen'.