In the Olympic Games all athletes should play fair the rules, but some often take drugs t

In the Olympic Games all athletes should play fair the rules, but some often take drugs to accomplish their aims.
A. with
B. for
C. against
D. by

A. withB. forC. against(答案→)D. by解析：考查介词辨析。By the rules意为按规则。句意为在奥林匹克运动会中，所有的运动员都要按比赛规则比赛，但是有的人经常服药来实现他们的目标。

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