They use computers to keep the traffic smoothly.A. being runB. runC. to runD. running

发布时间：2020-08-14 23:24:53

They use puters to keep the traffic      smoothly. 
A. being run
B. run
C. to run
D. running

网友回答

A. being run
B. run
C. to run
(答案→)D. running
解析：考查非谓语动词，这儿构成(keep sth. doing)。
以上问题属网友观点，不代表本站立场，仅供参考！