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Q:

The beavers have built a perfect dam across the stream  

  • 1
    A perfect dam had been built by the beavers across the stream.
  • 2
    A perfect dam has been built by the beavers across the stream.
  • 3
    A perfect dam have been built by the beavers across the stream.
  • 4
    A perfect dam was being built by the beavers across the stream
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Answer : 2. "A perfect dam has been built by the beavers across the stream. "
Explanation :

The present perfect tense is used in passive voice construction.

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