— There are still many old city walls in Xi’an, _______?
—Yes, there are.
| A．are there | B．aren’t there |
| C．are they | D．aren’t they |
— There are still many old city walls in Xi’an, _______?
—Yes, there are.
| A．are there | B．aren’t there |
| C．are they | D．aren’t they |
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