---Look!What's the driver doing?
---Look!What's the driver doing?
---He ___________ the car by the road.
A.must be repairing B.must repair C.may repair D.could be repairing
How to choose,translate and why?Thanks.
您好!A ,D A 是“一定正在修理”;D 是“可能正在修理”.又没上下文,如何取舍?