There is still a strong argument ________ mobile phones are a particular risk to children.
A．when 　B．which 　
C．that　D．what
C
句意：仍然有人堅持認(rèn)為，手機(jī)會對孩子造成特定的危險。分析句子結(jié)構(gòu)并結(jié)合句意可知，空處引導(dǎo)同位語從句，從句不缺少成分，應(yīng)用that引導(dǎo)。
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