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：考查介词。英语中in表示在一个时间范围内；on表示在具体某一天；with表示伴随状况；for表示原因目的等。根据前文四月一日，可知介词用on，故选B。