英语专八改错题~In Amrica,eye contact functiona as a kind of conversational traffic signal control the taking pace and time,and to indicate a change of topic.要改的地方在第二行,原题答案是把control前加个“to” ,我的回答

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and并列结构,前后要保持一致的 to control and to indicate

traffic signal，是用来 control 的。traffic signal 不是control 的主题或主语。
所以，改成不定式更确切。
而且，象楼下说的，and 有明确指出了，不定式更准确。

鱼旋许回答正确，我要补充的是 to 做的目的状语，如果你加ing就是一个名词形式，那么后面没有谓语就说不通了，除非把后面的and to 去掉，你可能考试紧张了吧，和我一样，这样简单的题有可能答错的！

1) 如果control后加上ing, to indicate 就要去掉to 并加上ing 才可以。因为有and做并列连词，双方必须平衡。

2) 就算加ing语法上不错，语感上却不理想。

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