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His brother graduated from Peking Unoversity in1998 and-----

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His brother graduated from Peking Unoversity in1998 and--------as a teacher in the weat ever since
A has worked
B is working
为什么不是B ,虽然有ever since 是现在完成的标志,但是通过句意可以看出是一直在西部工作啊.
His brother graduated from Peking Unoversity in1998 and-----
意思是自从98年开始 ever since必须用现在完成时
句意并没有说一直在做 强调是自从98年毕业后开始一直做
也是过去的发生的事情 也不可能用is