the language__for speaking on the phine is similar to that ofordinary conversation(used)为什么不填using?

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the language__for speaking on the phine is similar to that of
ordinary conversation(used)为什么不填using?

被动语态使用used,若主动语态才使用using.

这里的the language是指被动关系,被用来做什么。所以不能用现在分词形式。