Who is doing the work? ‘বাক্যটির Passive form হচ্ছে—-

1. By whom is the work being done?
2. By whom is the work done?
3. By whom was the work being done?
4. By whom is the work has done?

Answer: By whom is the work being done?

Explanation: Who যুক্ত Sentence কে Passive voice এ রূপান্তরের নিয়ম: By Whom + be verb (Subject এর person অনুযায়ী) + Subject + being + Verb এর Past Participle.