Choose the correct one:I think that someone built the house in 1814.
Correct answer: A. I think that the house was built in 1814.
- A. I think that the house was built in 1814.
- 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 active sentence 'someone built the house in 1814' is in the simple past. Its correct passive is the simple past passive 'the house was built in 1814', with the indefinite agent 'someone' dropped. Hence option A is correct; option D wrongly shifts to the past perfect.
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