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since most of the studies had failed to control for variables such as social class and family size, none could be taken seriously.
这个一起 作为 that引导的内容~ since...., none could be.... 如果你只有
declared that since most of the studies had failed to control for variables such as social class and family size 这是一个不完整的结构。 since不能单独成句, 就和 because he was late.单独出现错误一样, 你必须说 because he was late, his teacher punished him. |
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