考点一、关系代词与关系副词的辨析及基本用法
【考例1】
That evening, ______ I will tell you more about later, I ended up working very late. (2012全国II)
A. that B. which C. what D. when
解析：B。which引导非限制性定语从句，修饰That evening，which在从句中作介词about的宾语，从句意为“以后我会告诉你更多关于那天晚上的事”。从句缺少的是宾语，而不是时间状语，因此D项错误。
【考例2】
We live in an age ______ more information is available with greater ease than ever before. (2012浙江)
A. why B. when
C. to whom D. on which
解析：B。when引导的定语从句修饰先行词age。
