—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：.
D。since she join the Chinese Society为I have known Dr. Jackson since she join the Chinese Society之省略。连词since所搭配的时态通常是：主句用现在完成时，从句用一般过去时。