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。