Question

【题目】I decided to play a joke ________my sister ________April Fool's Day.
A.at; at
B.on; on
C.at; on
D.on; at

Answer 1

【答案】B
【解析】句意:我决定在愚人节和我的妹妹开个玩笑。play a joke on sb.跟某人开玩笑；愚人节是具体某一天，前面介词用on，故选B。