Change the voice: The engineers have built a perfect dam across the stream.
- A perfect dam across the stream has been built by the engineers.
- A perfect dam across the stream was built by the engineers.
- A perfect dam across the stream has built by the engineers.
- None of these
Explanation
Tense: Present Perfect (have built) → Passive: has been built
Active voice: The engineers have built a perfect dam across the stream.
Passive voice: A perfect dam across the stream has been built by the engineers.
"A perfect dam" is singular → has.
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