I don't think it's a book?添加2个词变为反意疑问句

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Idon''tthinkit''sabook?添加2个词变为反意疑问句Idon''tthinkit''sabook?添加2个词变为反意疑问句Idon''tthinkit''sabook?添加2个词变为反意疑问句I

I don't think it's a book?添加2个词变为反意疑问句
I don't think it's a book?添加2个词变为反意疑问句

I don't think it's a book?添加2个词变为反意疑问句
I don't think it's a book,is it?