问题
选择题
. — 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
答案
答案：A
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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
答案：A