题文
Ladies and gentlemen，please return to your seat and fasten your safety belt. Our plane_________.
| A．takes off | B．is taking off |
| C．has taken off | D．will be taking off |
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Ladies and gentlemen，please return to your seat and fasten your safety belt. Our plane_________.
| A．takes off | B．is taking off |
| C．has taken off | D．will be taking off |
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