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They have built a perfect dam across the river.

  • A.Across the river a perfect dam was built.
  • B.A perfect dam has been built by them across the river.
  • C.A perfect dam should have been built by them.
  • D.Across the river was a perfect dam.

Answer: B

Correct answer: A perfect dam has been built by them across the river.

The present perfect have built becomes has been built, agreeing with the new singular subject a perfect dam. The past-tense and modal options change when the building happened or whether it happened at all.

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