C. after which D. from this
　　析: C｡定语从句与先行词可连成and he went on to Cambridge after he was educated at a local grammar school而变成并列分句,因此该空应填after which引导非限制性定语从句,which代表主句内容｡
　　方法揭秘: 分析语境逻辑和句子结构看先行词是否能代替整个主句,从而确定是否应用which或as引导非限制性定语从句｡总之,解非限性的定语从句的题目,首先要弄清整个句子的意思;接着先行词在从句中起什么作用｡做到这两点就不难选出正确的关系词了｡

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