do you write to your pen-friend?— Once a week.A. How longB. How soonC. How far D. How ofte

问题补充：

do you write to your pen-friend?— Once a week.

A. How long

B. How soon

C. How far

D. How often

答案：

A. How long

B. How soon

C. How far

(答案→)D. How often

解析：从答语来看，是问频率，而how long 是问长度，how soon 问多久以后，how far 问距离，how often 是用来问频率的。

人教版九年级下册英语试题