单项选择题
A．Sorry, the number is engaged. Will you hold B．Yes, speaking. C．Hello,who're you,please D．Hello, thank you for calling.
A．Oh,ltm sorry B．Oh,excuse me C．No. I don't D．Yes,I have to
A．Yes, just call me A1 B．Yes, you may do that C．Of course not. But just a plain "Al" will do D．OK. Everyone does