问题描述：
lucy's backpak is behind the chair同义句
Lucy's backpack is ______ _____ ________ _______ the chaur
应该是Lucy's backpack is ______ _____ ________ _______ the chair
Lucy's backpack is ______ _____ ________ _______ the chaur
应该是Lucy's backpack is ______ _____ ________ _______ the chair
问题解答：
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