When to fasten the seat belt?（）

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A.for take-off

B.for landing

C.during air turbulence

D.whenever the Fasten Seat Belt sign is on

正确答案：for take-off；for landing；during air turbulence；whenever the Fasten Seat Belt sign is on

Tag：空中乘务情境会话时间：2022-01-19 20:34:33