—Have you known Dr. Jackson for a long time?
—Yes, since she________ the Chinese Society.
A．has joinedB．joinsC．had joinedD．joined
D
該句完整的句式是：I have known Dr. Jackson since she joined the Chinese Society. since后跟的時(shí)間狀語從句要用一般過去時(shí)，表示自從過去某個(gè)時(shí)間發(fā)生的動作到現(xiàn)在以來有多長時(shí)間了。
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