-Flight 551 for Dallas . I must be off now.----Have a pleasant trip then.A. is bein

问题补充：

---- 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

答案：

(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。