Question

A good friend from _____I was born showed up at my home right before I left for Beijing.

A．how

B．whom

C．when

D．which

Answer 1

C

试题分析：考查定语从句：因为这句话的意思是：在我正要离开北京时我出生时就开始关系很好的朋友出现在了我家里。强调的是个时间的概念，从出生时就关系很好了。用介词from+when引导定语从句，选C。
点评：定语从句的考查主要就是考查关系词的辨析，关系代词that, which, whose, whom, as， who在句中做主语，宾语，表语或者定语；where, why, when在句中做状语。要分析句子成分，看缺少什么成分，就选用相应的关系词。缺少介词就用介词+关系词引导定语从句。