作业帮that is an english book划线提问,把an english book划了线,提问是?
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that is an english book划线提问,把an english book划了线,提问是?
that is an english book划线提问,把an english book划了线,提问是?
that is an english book划线提问,把an english book划了线,提问是?
what is this?
(That 回答用this,this提问用that回答.反之亦然)