Which of the following is the correct passive form of: 'Did they complete the project on time?"

• কWas the project completed on time by them?
• খWere the project completed on time by them?
• গHas the project been completed on time by them?
• ঘDid the project complete on time by them?

সঠিক উত্তর: ক) Was the project completed on time by them?