—Have you known Dr. Jackson for a long time?
—Yes, since she _________ the Chinese Society.
A．has joinedB．joins
C．had joinedD．joined
D
.
D。since she join the Chinese Society為I have known Dr. Jackson since she join the Chinese Society之省略。連詞since所搭配的時(shí)態(tài)通常是：主句用現(xiàn)在完成時(shí)，從句用一般過去時(shí)。
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