not until she arrived at the meeting room did she realize she had forgotten to bring the document.
◆意思是:【直到她到达了会议室,她才意识到她忘记了将文档带来。】
句子等于【until she arrived at the meeting room she did not realize that she had forgotten to bring the document. 】
realize在 did not 后面,所以就不用过去时了。 to bring the document. 是 had forgotten 的宾语从句。所以其后的动词要用to动词 to bring。to 与the没有关系。the 是document 的定冠词。