－Have you known Dr Jackson for a long time?－Yes since she the Chinese SocietyA. has joine

问题补充：

－Have you known Dr Jackson for a long time?

－Yes，since she the Chinese Society．

A. has joined

B. joins

C. had joined

D. joined

答案：

A. has joined

B. joins

C. had joined

(答案→)D. joined

解析：考查时态。根据句意可知：自从她参加中文社团以来，她就认识了Dr Jackson。根据第一句的完成时时态可知她参加中文社团是过去发生的事情。