单选题 Not until the exam had begun ______ at the classroom?
A. should he have arrived B. had he arrived
C. did he arrive D. would he arrived

【正确答案】 C

【答案解析】[解析] 本题考查倒装结构中时态的用法。当某些具有否定含义的词或词组置于句首作状语时，如hardly，never，seldom，rarely，not until等，句子要使用部分倒装，即助动词放在主语之前。根据本句句意，考试开始了以后他才到达，到达的动作也已经发生，故选C。