问题详情：
―Have you known Dr. Jackson for a long time?
―Yes, since she________ the Chinese Society.
joined s joined ed
【回答】
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。
知识点：一般过去时及其被动式
题型：选择题
