If you are worried that the tickets will be sold out，you can buy a ticket________.
| A．in a row |
| B．in advance |
| C．on time |
| D．time after time |
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If you are worried that the tickets will be sold out，you can buy a ticket________.
| A．in a row |
| B．in advance |
| C．on time |
| D．time after time |
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