题目内容
12．-Jack，why didn't you answer my phone at 3：00 yesterday afternoon？-Oh，sorry．I________a concert at that time．（ ）
| A． | attend | B． | attended | C． | was attending | D． | will attend |
分析 --Jack，昨天下午三点你为什么没有接我的电话？
--哦，抱歉．那个时候我正在参加一个音乐会．
解答 答案：C．
根据时间状语at that time（那时）和问句"Jack，昨天下午三点你为什么没有接我的电话？"，判断设空处的动作在过去某个时刻正在进行着，且动作在一段时间内持续进行，所以用过去进行时，过去进行时的构成是：主语+was/were+动词的现在分词，主语是I所以be动词用was；故选C．
点评 本题考查了动词的时态．做题时，一定要特别关注有关的时间短语，这是判断句子时态的标志．在没有时间状语的情况下可以联系上下文根据语境来做出正确判断．
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