China'shigh-speedrailways

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China's high-speed railways _____ from 9,000 to 29,000 kilometres in the past few years.

A. are growing B. were growing C. will grow D. have grown

【解析】考查动词时态。句意：*的商铁在过去几年中由9 000千米增长到29 000千米。由“in the past few years”可知此处应用现在完成时态。故选D。