_____ when the light went on last night? A．What were you doing B．What have you done C．Wh
_____whenthelightwentonlastnight?A．WhatwereyoudoingB．WhathaveyoudoneC．WhatdidyoudoD．H...
_____ 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
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| A |
| 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. |
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