---Is there a bag on the desk? --- _________.
| A．Yes, there are. | B．No, there isn’t. |
| C．Yes, it is. | D．No, it isn’t. |
---Is there a bag on the desk? --- _________.
| A．Yes, there are. | B．No, there isn’t. |
| C．Yes, it is. | D．No, it isn’t. |
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