They put their books in the backpack.对划线部分提问.
划线部分是：in the backpack.
________ ________ __________ __________their books.
划线部分是：in the backpack.
________ ________ __________ __________their books？
人气：469 ℃ 时间：2020-03-27 02:51:54
解答
Where do they put their books
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