—Have you known Dr. Jackson for a long time?
—Yes，since she ________ the Chinese  Society.  
A．has joinedB．joins
C．had joinedD．joined
D
答案　D　[考查時(shí)態(tài)。主句用現(xiàn)在完成時(shí)，since引導(dǎo)的從句用一般過去時(shí)。]
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