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 请讲明理由~

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 请讲明理由~
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
请讲明理由~

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 请讲明理由~
D.joined
since 后面的时间是表示一个“点“.
I've lived here since 2000.

D
过去时，自从之后加过去时

choose D.问句如果是完成式的话，它的回答要用相应的过去式。

d
since+短暂性动词

D
用过去式表示从过去那个时间开始

A

D