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— 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。
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