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He has taught here since 1981

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He has taught here since 1981
与He has been teaching here since 1981有什么区别啊?
He has taught here since 1981
前一句表示强调过去发生的事情对现在造成了影响,属于现在完成时态.后一句表示从过去到现在并且还将持续,属于现在完成进行时,表示他一直在教书,并且还将教书
再问: 如果遇上填空或选择题,又该怎样选呢?是has taugh还是 has been teaching?
再答: 选择题打出来吧