－It’s necessary to limit the speed of electric bikes.－Yes, most riders of electric bikes in China 40-50 kilometers per hour often ignore red lights, the risk of traffic accidents.A.reaching; increaseB.reach; increaseC.to reach; to increaseD.reaching; increasing
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D解析本题考查非谓语动词。句意：在中国，大多数达到每小时40-50公里的电动车乘车者经常忽视红灯，这样就增加了交通事故的几率。第一个空是做riders of electric bikes 的定语，riders与reach构成主动关系；第二个空所在部分做结果状语，自然而然的结果用现在分词。