—Flight CA 581. I must be off now. —Have a nice trip.A. is being announcedB. has announced

问题补充：

—Flight CA 581. I must be off now. —Have a nice trip.

A. is being announced

B. has announced

C. was announcing

D. will be announced

答案：

(答案→)A. is being announced

B. has announced

C. was announcing

D. will be announced

解析：本题考查时态和语态。从语境知“CA 581航班正在通知(登机中)”，此处强调“现在这个时刻正在进行”的动作，所以用现在进行时，同时announce与Flight CA 581又是动宾关系，故用“现在进行时的被动语态”。