问题
选择题
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
答案
答案：B
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。