— Flight 551 for Dalas ______. I must be off now.
— Have a pleasant trip then.
| A．is being announced | B．has announced | C．was announcing | D．had been announced |
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— Flight 551 for Dalas ______. I must be off now.
— Have a pleasant trip then.
| A．is being announced | B．has announced | C．was announcing | D．had been announced |
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