What is the passive voice of `Who did this?`
By whom this has been done?
Whom did this ?
By whom was this done?
Correct
ho has done this?
Explanation:
Correct Answer is: By whom was this done?
Who যুক্ত Active Voice কে Passive voice এ রূপান্তরের নিয়ম: By whom + auxiliary verb + Sub (Active voice এর object) + Verb –এর Past Participle + question mark.