The correct passive form of the verb in this context is 3. had been fixed.
So the complete sentence would be: "My bike had been fixed last week, so I didn't train until today. I hope I haven't gained my weight."
The correct passive form of the verb in this context is 3. had been fixed.
So the complete sentence would be: "My bike had been fixed last week, so I didn't train until today. I hope I haven't gained my weight."