摘要： - Flight 551 for Dallas . I must be off now. - Have a pleasant trip then. A. is being announced B. has announced C. was announcing D. had been announced
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---- Flight 551 for Dallas ________. I must be off now.
------Have a pleasant trip then.
A.is being announced B. has announced C. was announcing D. had been announced
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---Flight 551 for Dallas ______. I must be off now.
---Have a pleasant trip then.
- A.is being announced
- B.has announced
- C.was announcing
- D.had been announced
—Flight 551 for Dallas ________. I must be off now.
—Have a pleasant trip then.
—Have a pleasant trip then.
[ ]
A. is being announced
B. has announced
C. was announcing
D. had been announced
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B. has announced
C. was announcing
D. had been announced
---- Flight 551 for Dallas ________. I must be off now.
------Have a pleasant trip then.
| A．is being announced | B．has announced | C．was announcing | D．had been announced |