【题目】A careless joke _____ an argument between the two friends, and so far they haven’t forgiven each other.
A. set down B. set up
C. set about D. set off
在线课程【答案】D
【解析】句意：一个粗心地玩笑会引发两个朋友之间的争论，到现在为止他们没有原谅对方.A. set down记下；放下；B. set up建立；C. set about出发；开始；D. set off引起；引发；出发；故答案为D。