◎ 题干
— Have you known Dr Jackson for a long time?
— Yes, since she _____ the Chinese Society.

A. has joined
B. joins
C. had joined
D. 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. has joined B. joins C. had joined D. 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。