2. 公务员
  3. They use computers to keep the traffic______smoothly.

They use computers to keep the traffic______smoothly.

admin2015-07-20  4
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。
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