◎ 题干
— Flight MU257 _____. I must be off now.
— Have a nice trip.

A. is being announced
B. has announced
C. was announcing
D. had been announced
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— Flight MU257 _____. I must be off now. — Have a nice trip. [ ]A. is being announced B. has announced C. was announcingD. had been announced …”主要考查了你对  【现在进行时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。