问题补充:
They use computers to keep the traffic smoothly.
A. being run
B. run
C. to run
D. running
答案:
A. being run
B. run
C. to run
(答案→)D. running
解析:考查非谓语动词Ving,这儿构成(keep sth. doing。)。
时间:2020-06-23 06:57:02
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
(答案→)D. running
解析:考查非谓语动词Ving,这儿构成(keep sth. doing。)。