第23题: [单项选择]Not until she arrived at the meeting room______ she had forgotten to bring the document. A. she realized B. did she realize C. she did realize D. does she realize 参考答案:B 答案解析:[详解] 本题考查对句子结构的掌握。当否定词not untill用于句首时,句子要部分倒装,因为句子是一般过去时态,所以答案选B。