— have you been learning English?—Since seven years agoA. How farB. How longC. How oftenD

问题补充：

— have you been learning English?

—Since seven years ago．

A. How far

B. How long

C. How often

D. How soon

答案：

A. How far

(答案→)B. How long

C. How often

D. How soon

解析：句意：你学英语有多久了？从七年前到现在（我一直在学）。How long多长；How soon多久；How often多久一次；How much多少钱。根据下文，Since seven years ago=for seven years七年的时间 ，可知前文问的是，多久，故选B。