In the school sports meeting, there are five players A, B, C, D, and E in a table tennis round-robin match, that is, every two players have to play one game, and only one game is allowed. It is stipulated that the winner gets 2 points, and the loser gets 0 points. Points, now know: A and B tied for first place, C and E tied for second place, find the score of D.
学校运动会上，有A，B，C，D，E五位选手进行乒乓球循环赛，即每两人都要打一场，且只许打一场，规定胜者得2分，负者得0分，现在知道：A与B并列第一名，C和E并列第二名，求D的得分．
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