第33题: [单项选择]Only after I had reached the airport______ that I had forgotten to take my ticket with me. A. I realized B. have I realized C. did I realize D. I had realized 参考答案:C 答案解析:[考点] 倒装结构
[解析] only+状语置于句首时,主句使用部分倒装结构,即将谓语部分的助动词置于主语之前。由从句中的过去完成时推知主句中应是一般过去时,故选C。