— Flight MU257 I must be off now.— Have a nice trip.A. is being announcedB. has announce

问题补充：

— 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：

(答案→)A. is being announced

B. has announced

C. was announcing

D. had been announced.

解析：本题考查时态。根据语境I must be off now 可知，MU257航班正在被播报，故用现在进行时的被动语态，故选A。