Do you remember the day we played all day along the seaside?A. whichB. thatC. whenD. abou

问题补充：

Do you remember the day we played all day along the seaside?

A. which

B. that

C. when

D. about which

答案：

A. which

B. that

(答案→)C. when

D. about which

解析：考查定语从句。先行词为the day，从句中不缺少主语或宾语，缺少时间状语，所以用when，选C。