1. A letter was written to her father by Mona.
  2. A letter has been written to her father by Mona.
  3. A letter was being written by Mona to her father.
  4. A letter was written by Mona to her father.
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1 Answers

Answer: Option 3

A letter was being written by Mona to her father. Given sentence is in past continuous tense and it is in active voice. Rule : Subject + (was /were) + being + V3 + Optional Agents.

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