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,

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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,

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,
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,

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,
b since引导的时间状语从句,主句用现在完成时态.

B
典型的现在完成时 since 后加过去时 前面用完成时
有不明白的地方再问哟,祝你学习进步,更上一层楼! (*^__^*)

Tom has a uncle .有什么错误 Tom has worked in a office for about five years. My uncle Tom has a big nose.改一般疑问句 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, Uncle Wang has worked here for ten years.(变同义句) Ten years ___ ___ since Uncle Wang__ here. Tom's uncle has been a policeman for five years.保持句子意思Tom's uncle has --- as a policeman --- five years ago. 请问Uncle tom是谁? uncle tom 是生么意思 My uncle has worked in Beijing for more than twenty years.同义句:My uncle___to work in Beijing__twenty years___. 1.He has a lot of ________(fun)stories to tell us.2.有一点害怕__________ 3.生病在家___________4.My father moved to Paris in 1991.(对to Paris提问)5.My uncle worked in the USA for ten years.(对for ten years提问)6.Tom bought his car i My uncle _____in Beijing for over 10yearS.now he lives in his hometown in Fuzhou.A、has worked B、wMy uncle _____in Beijing for over 10yearS.now he lives in his hometown in Fuzhou.A、has worked B、worked C、had worked D、worksfor+一段时间 再线Uncle John has worked here for almost 10 years.(),he has decided to leave here.括号内填but还是howerer uncle worked--------- a farm last year Tom was tired.He _______ all day.A was working B.has worked C worked ,Dhad been working分析一下原因 Uncle Wang has farm. 汤姆大叔翻译成 uncle Tom 还是Tom uncle uncle tom's cabin 中文翻译 Tom will tell you if he__his uncle the other day.A will visit B visited CvisitsD has visited