问题
选择题
---- 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
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。