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SAT语法题!(At the age of seventeen,A vicenna being a practicing

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SAT语法题!
(At the age of seventeen,A vicenna being a practicing physician,was when he proved) his rearkable competence by caing the seriously ill King of Bukhara.
C.A practicing physician at the age of seventeen,Avicenna proved
D.Practicing as a physician at the age of seventeen,Avicenna has proven
为什么D不可以呢
这句话是时态问题,请看原文关键部分:At the age of seventeen was when he( proved) his remarkable competence by caring the seriously ill King of Bukhara.
D答案前面部分不错,但 has proven 使用有误, at the age of seventeen 本身就是一个与过去时态连用的时间状语,它叙述过去发生的一件事,与现在无关,所以不可用现在完成时.