If the customer wants to book a round - trip ticket， the agent should ask：

If the customer wants to book a round - trip ticket， the agent should ask：
A.When do you want to return？
B.Why do you need a round - trip ticket？
C.Do you want to book one - way first？
D.Round - trip tickets are more expensive.
正确答案：A
试题解析：对于预订往返机票，询问返程时间是必要的信息。