单项选择题
W: Flight 331 is being announced. I’d better be on my way. Goodbye. Thank you and for your kind hospitality. M: You’re welcome. Happy landing.
A．In a plane. B．At the airport. C．At the railway station.
A．Good idea. B．OK. C．The same to you. D．Why not
A．didn't B．mustn't C．needn't D．hadn't