－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
网友回答
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。