Have you known Dr jackson for a long time?—Yes,since she()the chinese societyA has joined B joins C had joined D joined 要解析

Have you known Dr jackson for a long time?—Yes,since she()the chinese societyA has joined B joins C had joined D joined 要解析
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 要解析

Have you known Dr jackson for a long time?—Yes,since she()the chinese societyA has joined B joins C had joined D joined 要解析
D.
since和时间点连用表时间段.joined过去式表示这一动作发生在过去某一时刻.
主句用完成时,也就是：
l have known Dr jackson since she joined the chinese society.

vv

D
since 自从。。 用过去时

D，在现在完成句中，since后面的动词用一般过去时。

A.现在完成时B一般现在时的单三形式C.过去完成时D.一般过去时