题文
—Andy, are these your books?
—__________
| A．Yes, there are. |
| B．Yes, these are. |
| C．Yes, they are. |
| D．Yes, it is. |
—Andy, are these your books?
—__________
| A．Yes, there are. |
| B．Yes, these are. |
| C．Yes, they are. |
| D．Yes, it is. |
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