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There is still a strong argument ________ mobile phones are a particular risk to children.

Awhen  Bwhich  

Cthat Dwhat

 

C

【解析】句意:仍然有人坚持认为,手机会对孩子造成特定的危险。分析句子结构并结合句意可知,空处引导同位语从句,从句不缺少成分,应用that引导。

 

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