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They return their books to the libraryon time.此句可改为：They _ back their books _ the library on time.
题目详情
They return their books to the libraryon time.
此句可改为：
They _ back their books _ the library on time.
此句可改为：
They _ back their books _ the library on time.
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答案和解析
they give back their book to the library on time.
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