组卷网 > 高中英语综合库 > 语法 > 句法 > 特殊句式 > 强调句 > It be…that/who强调句型
题型:单项选择 难度:0.65 引用次数:507 题号:8694091
It is through years of research ________ scientists have discovered the relationship between social media addiction and depression.
A.sinceB.beforeC.thatD.when

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