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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.

题目详情
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.