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标题: 96-1-1 [打印本页]

作者: diatomss 时间: 2005-4-2 20:19 标题: 96-1-1

sociologists have long recognized that social tension-------

A elements from group living D are normal elements of group life

选D, 但是tension 不是复数阿，我查了，是不可数的，为什么用are? A中也许elements是个动词呢？

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