I think that someone built the house in 1814.
Correct answer: D. I think that the house had been built in 1814.
- A. I think that the house was built in 1814 by him.
- B. By think that the house was built in 1814.
- C. I think that the house built in 1814.
- D. I think that the house had been built in 1814.
Explanation
- The original sentence "I think that someone built the house in 1814" implies that the speaker is uncertain about who built the house, but believes it was built in 1814.- Option D, "I think that the house had been built in 1814", maintains the same meaning and uncertainty, using the passive voice to focus on the house rather than the builder.
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