【題目】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】

考查強(qiáng)調(diào)句型。句意：正是通過多年的研究，科學(xué)家們發(fā)現(xiàn)了社交媒體成癮和抑郁癥之間的關(guān)系。此處是強(qiáng)調(diào)句型：It is +強(qiáng)調(diào)部分+that+---。故選A。

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