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

A. sinceB. beforeC. thatD. when

【答案】C

【解析】

考查強(qiáng)調(diào)句型。句意: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,故答案為C。

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