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英语二级试题StartingfromApril18,2007,somepassengertrainsinChinawillrunasfastas250kilometershour.A.aB.anC.theD./

题目详情
英语二级试题
Starting from April 18,2007,some passenger trains in China will run as fast as 250 kilometers ___ hour.
A.a B.an C.the D./
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答案和解析
B,因为hour是元音开头