Flight 3010 I must be off now or I’ll be late.A. to announceB. is announcedC. is being ann

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。