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Mr.Black has been a phy sics teacher —— over twenty years As

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Mr.Black has been a phy sics teacher —— over twenty years Asince Bin C for D at
Mr.Black has been a phy sics teacher —— over twenty years As
选C.for
再问： 你能告诉我为什么吗
再答： 空后面是over twenty years，是一段时间。since后面一般接一个时间点，如twenty years ago排除。 完成时态表明一直以来都是物理老师，at只是一个时间点，也排除。 同样，in一般不用在完成时态中，排除。
再问： 上个星期我已经看过这部电影。”这句话英语怎么翻译用( already )
再答： I have already watched the movie(film) last week.
mr johnson has been a teacher for twenty years保持基本句意不变mr joh Mr .Zhang has been a teacher _________ twenty years.A for B. Mr Li has been a m___ of the Party for twenty years 英语:My father has been a teacher for ___(near) twenty years. Mr king has ____China for over 3 years.A gone to B been to C i have been a teacher for twenty years. I have been a teacher for twenty years 对for twenty years提问 Mr Black is a teacher. He_____for twenty years.A.has joined B.has been in the army Mr.Baker has been very ill for over a month,he has been too Mr wang has been an english teacher since three years ago.对s he has been a teacher for ten years he has ___ ____a teacher