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英语
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Uncle Tom has worked as a teacher __ he left school in 1999.a.before b.since c.after d.for
大哥大姐帮帮忙,选什么,为什么这样选,
人气：438 ℃ 时间：2020-03-21 13:11:33
解答
b since引导的时间状语从句,主句用现在完成时态.
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