摘要： They keep connected with each other the telephone.
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They use computers to keep the traffic _______ smoothly.
A. being run B. run C. to run D. running
They use computers to keep the traffic _______ smoothly.
A. being run B. run C. to run D. running
They use computers to keep the traffic _______ smoothly.
A. being run B. run C. to run D. running
A. being run B. run C. to run D. running 
A. being run B. run C. to run D. running