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把下面的句子改成单数或者复数形式1:What'sthis?2:Whosebookisthat3:Thosearehisbook.

题目详情
把下面的句子改成单数或者复数形式
1 :What's this?
2 :Whose book is that
3 :Those are his book.



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答案和解析
1.What are these?
2.Whose books are those?
3.That is his book.