单选题 Not until she bought her ticket and turned to walk away______that she was a streetcar conductor.
【正确答案】 B
【答案解析】解析：考查倒装句型。Not…until句型的倒装句结构：Not until+从句+助动词+主语+谓语……，语境表明主句的时态为一般过去时。句意：直到她买完票转身走开，我才意识 到她是检票员。