C.
It is ...(时间)since...固定句式
这句意思是自从他离开家乡已经过去10年了.=Ten years has passed since he left his hometown=He has been away from his hometown for 10 years
C.
It is ...(时间)since...固定句式
这句意思是自从他离开家乡已经过去10年了.=Ten years has passed since he left his hometown=He has been away from his hometown for 10 years