Not until she arrived at the meeting room ________ she had forgotten to bring the documentA. she realizedB. did she realizeC. she did realizeD. does she realize

步骤 1：识别句子结构
句子的主干是"Not until she arrived at the meeting room ________ she had forgotten to bring the document"。这是一个倒装句，因为"not until"引导的从句位于句首，主句需要部分倒装。
步骤 2：确定时态
根据句子的语境，"she had forgotten to bring the document"是过去完成时，表示在到达会议室之前她已经忘记了带文件。因此，主句的时态应该是过去时。
步骤 3：选择正确的倒装形式
在倒装句中，主句的助动词或情态动词需要提到主语之前。因此，"did she realize"是正确的倒装形式。