摘要：139、三份试卷在一次考试中，老师将三组题目发给学生。一组为２０题，一组为３０题，一组为４０题。全班同学都作了选择。题目收上来了。老师将选择２０题的学生都判为Ｃ等，尽管有的同学做的全对；老师把选择３０题
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