用be的合适形适填空These books ______in the backpack.

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用be的合适形适填空Thesebooks______inthebackpack.用be的合适形适填空Thesebooks______inthebackpack.用be的合适形适填空Thesebooks

用be的合适形适填空These books ______in the backpack.
用be的合适形适填空These books ______in the backpack.

用be的合适形适填空These books ______in the backpack.
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