摘要： They use computers to keep the traffic smoothly. A. being run B. run C. to run D. running [答案]D [解析]考查非谓语动词Ving.这儿构成.
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They use computers to keep the traffic _____ smoothly.
A. being run B. run C. to run D. running
查看习题详情和答案>>They use computers to keep the traffic _______ smoothly.
A. being run B. run C. to run D. running
查看习题详情和答案>>They use computers to keep the traffic smoothly.
A. being run B. run C. to run D. running
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