Choose the correct passive voice: "The workers had built the wall by evening."
- A. The wall was built by the workers by evening.
- B. The wall had being built by the workers by evening.
- C. The wall has been built by the workers by evening.
- D. The wall had been built by the workers by evening. ✓
Correct answer
D. The wall had been built by the workers by evening.
Explanation
Past perfect active becomes past perfect passive: 'had been built'.