第27题: [单项选择]There Was a knock at the door. It was the second time someone ______ me that evening. A. had interrupted B. would have interrupted C. to have interrupted D. to interrupt 参考答案:A 答案解析:动词时态。句子出现了the second time,可知要用完成时;句子讲述过去发生的事情,所以用过去完成时。
第28题: [单项选择]下列()不是信息技术的核心技术。 A. 计算机技术 B. 操作技术 C. 微电子技术 D. 现代通信技术 参考答案:B