The work has been done sincerely by them for five years. ( Active)

• ক They have been doing the work sincerely for five years. ✅ সঠিক উত্তর
• খ They have did the work sincerely for five years.
• গ They has doing the work sincerely for five years.
• ঘ They have been doing the work sincerely for five years.