How often do you hear from your pen friend?
问题描述：
How often do you hear from your pen friend?
答
你多久收到一次你笔友的来信
答
你多久收到一次你笔友的信？
答
你多久才收到你笔友的平来信? how often:指多久. hear from：指收到谁的来信.
答
你多长时间收到一次你笔友的信？