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变疑问句和否定句：The exam begins at nine.Ann returned the book to the library yesterday.
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变疑问句和否定句：The exam begins at nine.Ann returned the book to the library yesterday.
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答案和解析
when does the exam begins?The exam doesn't begin at nine
Did Ann return the book to the library yesterday?
Ann didn't return the book to the library yesterday.
Did Ann return the book to the library yesterday?
Ann didn't return the book to the library yesterday.
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