问题补充:
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:
A. how
B. whom
C. when
D. which
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 whenI 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。