8.By the time he was ten years old,he ___D______.的解析A.has completed university B.has completed the universityc.had completed an university D.had completed university
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8.By the time he was ten years old,he ___D______.的解析A.has completed university B.has completed the universityc.had completed an university D.had completed university
8.By the time he was ten years old,he ___D______.的解析
A.has completed university B.has completed the university
c.had completed an university D.had completed university
8.By the time he was ten years old,he ___D______.的解析A.has completed university B.has completed the universityc.had completed an university D.had completed university
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.
by the time 1)到…时候为止; 2)…当……的时候;
by the time 1)到…时候为止
通常引导一个时间状语从句，表示“到……的时候为止”主句则表示在此时间之前某个事件已完成。值得注意的是，当从句用过去时时，主句通常用过去完成时。
一般情况下，by the time 主句用过去完成时态，从句用一般过去时态。