这个句子的意思是：到他十岁大的时候,已经读完了大学.这个描述的是过去某时间点已经完成的事,所以事态用过去完成时.而这句话里的大学是统称,表示学历,而不是说某个具体的大学,所以用University,而不用an university.
8.By the time he was ten years old,he ___D______.的解析
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