A、  B、  C、  B问题以why开头，询问没来参加聚会的原因。(B)回答说没能记住(参加聚会)，因此是正确答案。

Which room should I reserve for the meeting?
(A) It’s at 8, tomorrow.
(B) For a week, please.
(C) The one facing the park.

Why didn’t you come to the party last Friday?
(A) It was Saturday, actually.
(B) I just didn’t remember.
(C) Right, I’m a member.