单选题 After the investigation, it was concluded that the old man was responsible for the accident.
【正确答案】 D
【答案解析】[答案精解] 在这次调查后,得出的结论是这位老人对这起交通事故负责。It was concluded是固定用法,意为“得出结论”。be responsible for意为“对某事负责”。