根绝首字母提示或用适当的介词填空your books are u___________the chair.please pick them up.

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根绝首字母提示或用适当的介词填空your books are u___________the chair.please pick them up.
根绝首字母提示或用适当的介词填空your books are u___________the chair.please pick them up.

根绝首字母提示或用适当的介词填空your books are u___________the chair.please pick them up.
your books are under the chair