问题
选择题
— 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
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。