题目内容
14．What _____at nine o'clock last Sunday morning？（ ）| A． | were you doing | B． | was you doing | C． | are you doing |
分析 上个星期天早上九点你正在干什么？
解答 答案：A，考查过去进行时．句意"上个星期天早上九点你正在干什么？"根据题干at nine o'clock last Sunday morning？可知问的是过去这个时间正在做什么，是过去进行时．根据过去进行时的特殊疑问句的基本构成，结构为was或were doing，第二人称you用were．故选A．
点评 理解过去进行时的基本结构，根据具体内容作答．
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