---DoyouknowabouttheRoadTrafficSafetyLaw?---Yeah．ItwentintoeffectinMay

发布时间：2020-08-07 04:46:21

---Do you know about the Road Traffic Safety Law?---Yeah．It went into effect in May and traffic safety in our city ________ since．A.improvedB.has improvedC.had improvedD.will have improved

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B解析根据句中since一词，可判断应用完成时态，据句意确定B．
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