they use computers to keep the traffic ( ) smoothly. A.being run B.run C.to sun D.running
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时间：2024-08-17 11:06:00
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they use computers to keep the traffic ( ) smoothly. A.being run B.run C.to sun D.running【
【专家解说】：D.running keep sb/sth doing 固定短语 让某人/某物一直处于某种状态，记住就可以了。
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