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    【题目】It is through years of research ________ scientists have discovered the relationship between social media addiction and depression.

    A. that B. before

    C. since D. when

    【答案】A

    【解析】

    考查强调句型。句意：正是通过多年的研究，科学家们发现了社交媒体成瘾和抑郁症之间的关系。此处是强调句型：It is +强调部分+that+---。故选A。

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