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SAT语法题解答(At the age of 17,Avicenna being a practicing physic

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SAT语法题解答
(At the age of 17,Avicenna being a practicing physician,was when he proved )his remarkable competence by caring the seriously ill king of Bukhara.
c)A practicing physician,at the age of 17,Avicenna proved(正确答案)
D) A practicing physician at the age of 17 named Avicenna,proved
为什么D不可以选啊?
为什么主语和谓语之间要加一个逗号隔开啊,前面又不是插入语.而且在SAT中能不用被动就不用被动,明显C比D看着顺眼.