--- Is this your backpack? ---________________.It’s my backpack.
| A．Yes，this is. | B．No， it is. |
| C．No，it isn’t. | D．Yes， it is. |
--- Is this your backpack? ---________________.It’s my backpack.
| A．Yes，this is. | B．No， it is. |
| C．No，it isn’t. | D．Yes， it is. |
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