— Flight MU257 ______, I must be off now.
— Have a nice trip.
A．is being announcedB．has announced
C．was announcingD．had been announced.
A
本題考查時(shí)態(tài)。根據(jù)語境I must be off now 可知，MU257航班正在被播報(bào)，故用現(xiàn)在進(jìn)行時(shí)的被動(dòng)語態(tài)，故選A。
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