---- Flight 551 for Dallas . I must be off now.
------Have a pleasant trip then.
A. is being announced
B. has announced
C. was announcing
D. had been announced
网友回答
(答案→)A. is being announced
B. has announced
C. was announcing
D. had been announced
解析：考查时态及语态。句意：飞往戴勒斯的551航班正在被播放呢，我现在必须要走了。祝旅途愉快。正在被播放的动作应用现在进行时的被动语态。所以选A。