Question

— ____________?                                    
— Since I was five years old.
A. How often do you skate?
B. When did you begin to play baseball?
C. How long have you been studying French

Answer 1

C

解析试题分析： since自从，常跟现在完成时连用，how long多长时间。how often多久一次，提问频率。when什么时候，提问时间。句意：你学习法语多长时间了？自从我五岁开始。故选C。
考点：考查特殊疑问词的用法。