---- 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
考查時態(tài)及語態(tài)。句意：飛往戴勒斯的551航班正在被播放呢，我現(xiàn)在必須要走了。祝旅途愉快。正在被播放的動作應(yīng)用現(xiàn)在進(jìn)行時的被動語態(tài)。所以選A。
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