单选题 This is the best one of automobiles that ______ in working order.
A. is B. are C. had been D. have

【正确答案】 B
【答案解析】[解析] 解此题关键在于弄清that从句的先行词是哪一个。根据题意，先行词应是automobiles，而非前面的the best one。