Saturday is the day ____ people can have a rest.A. thatB. at whichC. on whichD. on that

问题描述:

Saturday is the day ____ people can have a rest.
A. that
B. at which
C. on which
D. on that

答案为C
因为这道题考察的定语从句,从句的句子成分满足,所以这里缺关系副词,又由先行词决定介词用on ,因为在讲解定居从句的时候其中 说,when 可以用on which ,但不是绝对的.