the woman will never forget the day [ ] they first metA that B on which C on that Dwhich应选择哪一个,并说明,谢谢
问题描述：
the woman will never forget the day [ ] they first met
A that B on which C on that Dwhich应选择哪一个,并说明,谢谢
答
B on which = when 做时间状语由于从句中they主语met 谓语（不及物不带宾语）只差一个状语,所以选on which B