Question

—______ do you write to your parents?  —Every day.

A．How long

B．How soon

C．How often

D．How far

Answer 1

C

根据此题的回答Every day可知是在问频率所以用How often“多久一次”来提问。How long 应回答长度； How soon 应回答时间； How far应回答距离。选C。