concurrent validity
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尽管大学英语四级考试测试的效度已被证明，但因为全国范围的大规模限制，无论从其表面效度、结构效度、内容效度还是同期效度上，都不能说它适合测量应试者的英语交际能力。
Obviously, though the validity of it has been proved, CET-4, which is limited by its large scale, is not an appropriate test for the purpose of testing communicative competence.
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