A letter was writing by Sheila
A letter was being writing by Sheila
A letter was being written by Sheila
A letter was been written by Sheila
Source: ১৬ তম (বিশেষ) বিসিএস (প্রিলিমিনারি) (শিক্ষা) (01-01-1994)
Answer: A letter was being written by Sheila
Explanation:
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