They use computers to keep the traffic smoothly. [ ]A. being run B. run C. to ru
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![They use computers to keep the traffic smoothly. [ ]A. being run B. run C. to ru](/pic/43_1429187.jpg)
They use computers to keep the traffic _____ smoothly.
[ ]
A. being runB. run
C. to run
D. running
试题答案
D
![They use computers to keep the traffic smoothly. [ ]A. being run B. run C. to ru](/pic/43_1429187.jpg)
They use computers to keep the traffic _____ smoothly.
[ ]
A. being runD