What is the passive voice of this sentence- ''Who offered you the job?''

• Who যুক্ত interrogative sentence কে passive করার নিয়ম:
- Who এর পরিবর্তে By whom +
- Auxiliary verb +
- object টির Subject +
- মূল verb এর past participle +
- by/ to/with +
- Subject এর Object +
- প্রশ্নবোধক চিহ্ন।
যেমন, Active Voice: Who offered you the job? 
Passive Voice: By whom was the job offered to you?

Active Voice: Who is calling me?
Passive Voice: By whom am I being called?

Source: Website English Wizard, Saleh Ahmed, Advanced Learner's English Grammar & Composition.Applied English Grammar & Composition by P.C. Das