---When did the young man save you?---January 1st,2000, the firs

---When did the young man save you?
---January 1st,2000, the first day of the new century, _______ I can never forget.
A、when
B、which
C、that
D、where
【正确答案】：B
【题目解析】：考查非限制性定语从句的关系词。先行词the first day在定语从句中作宾语。