题目内容
_____ when the light went on last night?
| A．What were you doing | B．What have you done |
| C．What did you do | D．How were you doing |
A
解析试题分析：句意：昨天夜晚，当灯亮的时候你正在做什么？时间限定在一段时间之间，应用进行时，由于是过去的动作，固用过去进行时，故选A.
考点：考查时态的用法。
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