He has taught here since 1981与He has been teaching here since 1981有什么区别啊?

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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
• 1,My brother left school in 2005 ,and since then he ( ) in Beijing .A,lives B,lived C,will live D ,has lived 选什么?不是应该选B吗,可答案为什么选D啊,句中都没有什么词体现出来要用现在完成时的呀?就只有since而已嘛,可是不是说since可以引导什么状语从句啊,什么主句用一般现在时/现在完成时,从句用一般过去时这样吗,所以说这句话为什么不能用一般过去时啊?顺便问一下,since 引导时哪个是从句和主句啊?
• My brother left school in 2005,an since then he ___ in shanghai.A,lived B,has lived 填哪一个呢?填哪一个个呢?帮忙解释下两种时态在此处的区别吧.为什么其中一个不对.