This is (a math) book.对括号内容提问,说理由

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This is (a math) book.对括号内容提问,说理由
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This is (a math) book.对括号内容提问,说理由
This is (a math) book.
对括号内容提问,说理由

This is (a math) book.对括号内容提问,说理由
What book is this?
be动词提前,加疑问词what book.
应该就是这样了.