题目内容
8．The Greens ______ breakfast when the door bell rang．（ ）| A． | had | B． | would have | C． | are having | D． | were having |
分析 当门铃响的时候，格林一家在吃早餐．
解答 答案：D．
根据when the door bell rang 引导的时间状语从句用了一般过去时，当…时，判断设空处的动作"吃早餐"在过去的某个时刻正在进行着，且是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The Greens（格林一家）是复数，所以be动词用were，have的现在分词是having；故选D．
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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