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一道选择题选D这是不是和题中since有关,为啥?~谢谢亲们的帮助-----HaveyouknownDr.Jacksonforalongtime?-----Yes,sinceshetheChineseSociety.AhasjoinedBjoinsChasjoinedDjoined

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一道选择题选D 这是不是和题中since有关,为啥?~谢谢亲们的帮助
-----Have you known Dr. Jackson for a long time?-----Yes,since she ____the Chinese Society. A has joined B joins C has joined D joined
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答案和解析
是的,与since有关.since接过去的时间表点,如果用从句表示这个时间点,这个从句要用一般过去时.这句话是省略句,补全后是:
I have known Dr.Jackson since she joined the Chinese Society.