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1. They use computers to keep the traffic       (run) smoothly.

1. running此处构成keep sth doing的固定用法,现在分词作动词keep的宾语补足语。

traffic与nm之间是主谓关系,所以用现在分词。

题目来源:全品基础小练习高考英语新课标全国卷地区专用 > 第21-40天

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