When did you start to work in this company?___ .I have worked here for fifteen years.A in my twenties B since 1997 C During the 1990s 我觉得是A,但老师说是B when不应该是时间点吗?B的话算是一个点吗?

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When did you start to work in this company?___ .I have worked here for fifteen years.A in my twenties B since 1997 C During the 1990s 我觉得是A,但老师说是B when不应该是时间点吗?B的话算是一个点吗?

When did you start to work in this company?___ .I have worked here for fifteen years.A in my twenties B since 1997 C During the 1990s 我觉得是A,但老师说是B when不应该是时间点吗?B的话算是一个点吗?
When did you start to work in this company?___ .I have worked here for fifteen years.
A in my twenties B since 1997 C During the 1990s 我觉得是A,但老师说是B when不应该是时间点吗?B的话算是一个点吗?

When did you start to work in this company?___ .I have worked here for fifteen years.A in my twenties B since 1997 C During the 1990s 我觉得是A,但老师说是B when不应该是时间点吗?B的话算是一个点吗?
B是自1997年以来,与后面我在此已工作了15年相呼应,现在完成多与since 连用