问题描述：
【08宁夏卷】27.—Have you known Dr.Jackson for a long time?
27.—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
为什么不是A
还有翻译一下.
27.—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
为什么不是A
还有翻译一下.
问题解答：
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