Which one is the correct form of past continuous tense?

• কHe was too much busy as he was doing his homework
• খHe was too much busy as he was being done his homework
• গHe was too much busy as he doing his homework
• ঘHe was too much busy as he did his homework

সঠিক উত্তর: ক) He was too much busy as he was doing his homework