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

1. running此處構(gòu)成keep sth doing的固定用法,現(xiàn)在分詞作動詞keep的賓語補足語。

traffic與nm之間是主謂關(guān)系,所以用現(xiàn)在分詞。

題目來源:全品基礎(chǔ)小練習(xí)高考英語新課標全國卷地區(qū)專用 > 第21-40天

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