题目内容
18．What ________ you _______ when the captain came in？（ ）| A． | are； doing | B． | did； do | C． | were； doing |
分析 当队长进来的时候你在做什么？
解答 答案：C．
根据when引导的时间状语从句用了一般过去时，判断设空处问的是在过去某个时刻正在进行的动作，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，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状语从句的类型来做出正确判断．
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