April 1 st is a special day, practical jokes may be played without punishment.
A. in which
B. on which
C. with which
D. for which
网友回答
A. in which
(答案→)B. on which
C. with which
D. for which
解析：考查定语从句。句意为：四月一日是一个特殊的日子，在这一天可以搞恶作剧而不受惩罚。which代指先行词day，具体到“在某一天”用介词on，故答案选B。