单选题 He must have had an accident, or he ______ here then.
A. should be B. would be
C. could have been D. would have been

【正确答案】 D
【答案解析】[解析] 第一句推断他必定出了事故，or暗含一种与事实相反的假设条件，即if he had not had all accident，因此D为正确答案。