I can never forget the day we worked together.A. whenB. whichC. thatD. /

问题补充：

I can never forget the day we worked together.

A. when

B. which

C. that

D. /

答案：

(答案→)A. when

B. which

C. that

D. /

解析：本题考查的定语从句，当先行词为时间的名词时，要考虑关系代词或关系副词在从句中所做的成分，如果在从句中作为主语，宾语，则用关系代词，如果在从句中作为状语的话，要用关系副词，故选A。