单选题 A: You have a call on line one.
B: ______.

A、 I forgot to call you back.
B、 Actually, it's two o'clock.
C、 Take a message for me, please.
D、 The lines are keeping busy.

【正确答案】 C

【答案解析】A方告诉B方“有人通过一号线打电话给你”，B方请A方帮他记下口信。