【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
在线课程【答案】C
【解析】
试题分析：本题对学生来说较难，不容易看的懂。句意：就在我去北京前夕，一位我儿时的好朋友到我家来了。from I was born是后置定语，修饰主语A good friend of mine，showed up是谓语动词，根据句意，故选C项。