问题描述：
We may pack our school bags before we leave our classroom.(改为否定句） We _____ _____ pack our scho
We may pack our school bags before we leave our classroom.(改为否定句）
We _____ _____ pack our school bags before we leave our classroom.
We may pack our school bags before we leave our classroom.(改为否定句）
We _____ _____ pack our school bags before we leave our classroom.
问题解答：
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