◎ 题干
—Have you known Dr. Jackson for a long time?
—Yes, since she         the Chinese Society.  
[     ]
A. joined              
B. joins                  
C. has joined
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Have you known Dr. Jackson for a long time?—Yes, since she the Chinese Society.[ ]A. joined B. joins C. has joined…”主要考查了你对  【一般过去时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。