Choose the correct passive voice of ‘I had written the letter’. -

Explanation:Have/Has/Had + V3 যুক্ত Active voice কে Passive voice এ রূপান্তর।Active: Subject + have/has/had + V3 + Object.Passive: Object টি Subject হয় + have/has/had + been + V3 + by + Subject টি Object হয়।N.B. Active voice টি Present perfect হলে have/has এবং past perfect হলে had বসে।Correct Sentence: The letter had been written by me.