The correct passive of “Sheila was writing a letter” is-

1. The correct passive of “Sheila was writing a letter” is-

[16 th BCS Preliminary : 1994]

1. A letter was written by Sheila

2. A letter was being writing by Sheila

3. A letter was being was being written by Sheila

4. A letter was being written by Sheila

Answer

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