—Have you known Dr. Jackson for a long time? —Yes, since she______the Chinese Society.

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问题 —Have you known Dr. Jackson for a long time? —Yes, since she______the Chinese Society.

选项 A、has joined
B、joins
C、had joined
D、joined

答案D

解析该句完整的句式是：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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