题目内容

It has been proved _______ violence on television has a bad effect on children.
A.whetherB.becauseC.whatD.that
D
It has been proved that … 意为“已经证明”。It为形式主语,真正的主语为that引导的从句。句意为:事实证明,暴力电视节日对儿童有不良影响。
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