My cousin has been learning English she was six years old.A. whenB. sinceC. untilD. becaus

问题补充：

My cousin has been learning English she was six years old.

A. when

B. since

C. until

D. because

答案：

A. when

(答案→)B. since

C. until

D. because

解析：since是从…来的意思，经常在完成时中