1. Across the river a perfect dam was built.
  2. A perfect dam has been built by them across the river.
  3. A perfect dam should have been built by them.
  4. Across the river was a perfect dam.
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1 Answers

Answer: Option 2

A perfect dam has been built by them across the river. Dam is an object so has been used and the they in the active voice has become them in the passive voice.

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