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bad question... no unique solution
(2)丙、丁都爱踢足球 - DOES NOT necessarily mean they know each other...Therefore, (3)第一、三名在这次比赛时才认识 DOES NOT necessarily mean  丙&丁 cannot be 第一&三名...the question is flawed...
* h2 K( f" {! N4 s5 {: R7 VIt should say (2)丙、丁都爱踢足球 TOGETHER.
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