what’s this (回答)( )( )a book

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what’sthis(回答)()()abookwhat’sthis(回答)()()abookwhat’sthis(回答)()()abookItis它是thisisthisisitis口语

what’s this (回答)( )( )a book
what’s this (回答)( )( )a book

what’s this (回答)( )( )a book
It is
它是

this is

it is口语