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1.I'm busy sweeping the floor.

分析 我在忙着打扫地板.

解答 答案:sweeping.
根据所给首字母提示结合推测句意是"我在忙着打扫地板.",根据设空处前面的be busy 判断设空处缺少动词的ing形式,所填单词"打扫"是sweep,所以答案是:sweeping

点评 做这类题型,首先根据所给单词首字母明确句子所要考查的单词的拼写,再结合相关语法知识对单词做出形式上的变化.

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