昨晚九点你在做什么呢?
at nine o'clock last night?
What were you doing.
【分析】What were you doing at nine o'clock last night?
【解答】根据句意,原句是询问过去某个时间正在进行的动作,用过去进行时was/were doing的结构,主语you表示"你"是第二人称,系动词用were.疑问词what表示"什么",作do的宾语, 所以空格处填What were you doing.
【点评】此题考查汉译英,在熟知每个汉语的英语翻译的基础上,根据语法结构,组合短语或者句子,便可得出正确答案.