第2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。
第3题: [单项选择]对堵漏器材的保管错误的是()。 A. 金属活动部位应经常加油润滑 B. 纤维质材料经常晾晒 C. 橡胶垫或填料应用油漆标记 D. 水泥每年要更换一次或轮换使用 参考答案:C