—Flight CA 581_____________. I must be off now.   —Have a nice trip.
A．is being announcedB．has announcedC．was announcingD．will be announced
A
本題考查時態(tài)和語態(tài)。從語境知“CA 581航班正在通知(登機中)”，此處強調(diào)“現(xiàn)在這個時刻正在進(jìn)行”的動作，所以用現(xiàn)在進(jìn)行時，同時announce與Flight CA 581又是動賓關(guān)系，故用“現(xiàn)在進(jìn)行時的被動語態(tài)”。
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