单选题 I was held up by the traffic jam, otherwise I ______ here 50 minutes sooner.
A. would be B. ought to have been
C. would have been D. must have been

【正确答案】 C

【答案解析】[解析] otherwise“否则”，连接副词，引导一个与过去事实相反的假设，相当于if I had not been held up by the traffic jam，因此句子谓语需用虚拟过去时。would be是虚拟现在时的结果句。ought to have been“本来应该”；must have been“一定已经”，纯属推断。