I slipped and fell while I______.

admin2009-06-21  40

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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