问题补充:
Flight 3010,I must be off now or I’ll be late.
A. to announce
B. is announced
C. is being announced
D. announced
答案:
A. to announce
B. is announced
(答案→)C. is being announced
D. announced
解析:考查时态。根据I must be off now or I’ll be late.我现在必须走了,否则我将迟了,可知3010航班正在被通知,故用现在进行时的被动形式,选C。