◎ 题干
It has been proved________violence on television has a bad effect on the development of children.
[     ]
A.whether  
B.because  
C.when  
D.that
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“It has been proved________violence on television has a bad effect on the development of children.[ ]A.whetherB.becauseC.whenD.that…”主要考查了你对  【主语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。