When Ientered the house,he was busy 【clean】the flo

发布时间：2021-02-28 03:17:34

When Ientered the house,he was busy 【clean】the floor.适当形式填空

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cleaning
be busy doing something.忙于做某事
======以下答案可供参考======
供参考答案1:
in cleaning
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