A. had been B. was

C. has been D. were

【答案】A

【解析】考查虚拟语气。句意：如果他更仔细些，他会在期末考试中得到更好的成绩。根据句意和主句中的谓语动词would have got可推断，空格处所在句子表示与过去相反的假设，从句中的谓语动词用过去完成时。故选A。