The beavers have built a perfect dam across the stream A. The beavers have built a perfect dam across the stream B. A perfect dam has been built by the beavers across the stream. C. A perfect dam have been built by the beavers across the stream. D. A perfect dam was being built by the beavers across the stream. Answer Workspace Report Discuss Answer with explanation Answer: Option B Explanation A perfect dam has been built by the beavers across the stream. Workspace
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