题目内容

---- Flight 551 for Dallas ________. I must be off now.
------Have a pleasant trip then.
A．is being announcedB．has announcedC．was announcingD．had been announced
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。
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