It has been proved _______ violence on television has a bad effect on children.

A. whether     B. because      C. what       D. that

D


解析:

It has been proved that … 意為“已經(jīng)證明”。It為形式主語，真正的主語為that引導(dǎo)的從句。句意為：事實(shí)證明，暴力電視節(jié)日對兒童有不良影響。

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