题目

A good friend of mine from         I was born showed up at my home right before I left for Beijing． A．how           B．whom             C．when         D．which 答案：  C 解析: 考查定语从句的引导词。本句中的主语是A good friend of mine，谓语动词是showed up，中间from when I was born为定语从句修饰friend，又因定语从句不缺成分，所以不用B和D，根据句意又排除A。

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