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