问题描述：
He taught in a mountain village for more than ten years,___ he became a civil servant and became very famous soon.
A.from which B.from where C.after that D.after which
这个题答案选D,为什么不能选 A或C啊
A.from which B.from where C.after that D.after which
这个题答案选D,为什么不能选 A或C啊
问题解答：
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