— 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.
网友回答
(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。