That evening, I will tell you more about later, I ended up working very late.
A. that
B. which
C. what
D. when
网友回答
A. that
(答案→)B. which
C. what
D. when
解析：这里that evening是先行词，其在定语从句中作介词about的宾语，所以用which。句意：以后我将和你谈起的那个晚上，我工作到了很晚。
【考点定位】考查非限制性定语从句的关系词。