Four teams of three people would pete the game and the winners would receive a free vacation.
A. in
B. against
C. for
D. with
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(答案→)A. in
B. against
C. for
D. with
解析：
试题分析:考查介词辨析。A在….里;B 反对;C 为了;D 和….一起。pete in在….中竞赛;pete against与….竞赛;pete for为争取…..而比赛;pete with与…..竞赛; 根据语境可知此处是指在比赛中竞赛，所以选A。句意：四个三人组的小队将要在这次比赛进行角逐，获胜者将获得免费的假期。