They use computers to keep the traffic________smoothly._刷题宝

题干

They use computers to keep the traffic________smoothly.

A：being run

B：run

C：to run

D：running

上一题下一题 0.0难度选择题更新时间:2011-10-21 11:58:02

答案(点此获取答案解析）

D

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