2. 外语
  3. The boy was busy with his homework when I came in.The boy was busy ______ ______ his homework when I came in.

The boy was busy with his homework when I came in.The boy was busy ______ ______ his homework when I came in.

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问题 The boy was busy with his homework when I came in.The boy was busy ______ ______ his homework when I came in.
选项
答案in doing
解析
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