—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

 

D

【解析】答案　D　[考查時(shí)態(tài)。主句用現(xiàn)在完成時(shí)，since引導(dǎo)的從句用一般過(guò)去時(shí)。]

 

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