s that your book?---Yes,________.这为什么填的是yes,it is .而不是yes,that is .所有以Is that 开头问的都要用it is回答吗?

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• s that your book?---Yes,________.这为什么填的是yes,it is .而不是yes,that is .
• s that your book?---Yes,________.这为什么填的是yes,it is .而不是yes,that is .所有以Is that 开头问的都要用it is回答吗?
• _______?Yes,it is.A.Is that your book.B.Are these your books.C.Is there a book.（选择—）
• is that your a book?哪里错了This is a pen and that's a ruler?Is this his pencil?哪里错了!求