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—Have you known Dr. Jackson for a long time?
—Yes, since she________ the Chinese Society.
A.has joinedB.joinsC.had joinedD.joined
D
该句完整的句式是:I have known Dr. Jackson since she joined the Chinese Society. since后跟的时间状语从句要用一般过去时,表示自从过去某个时间发生的动作到现在以来有多长时间了。
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