-- How do you do?A. Fine. Thank you.B. How do you do?C. Good.D. How are you?

问题补充：

-- How do you do?

---

A. Fine. Thank you.

B. How do you do?

C. Good.

D. How are you?

答案：

A. Fine. Thank you.

(答案→)B. How do you do?

C. Good.

D. How are you?

解析：在正统的场合当别人对您说您好，你也应该对别人说同样的话，故选B。