I slipped and fell while I______.

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问题 I slipped and fell while I______.

选项 A、am cleaning windows
B、clean windows
C、was cleaning windows

答案C

解析由slipped and fell 判断本句是过去时，while 代表“当……发生的时候”，因此用过去进行时：主语+was／were doing。

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公共英语一级笔试

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I slipped and fell while I______.

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