They use computers to keep the traffic______smoothly.

admin2015-07-20 3

问题 They use computers to keep the traffic______smoothly.

选项 A、being run
B、run
C、to run
D、running

答案D

解析考查非谓语动词。这里构成keep sth．doing。

转载请注明原文地址:https://www.kaotiyun.com/show/X9Oq777K

小学英语

相关试题推荐

随机试题

最新回复(0)