China a high-speed railway network covering almost all its cities with a population of of more than 500.000 by 2015．A．is setting upB．will set upC．has set upD．will have set up 题目和参考答案——青夏教育精英家教网—

题目内容

China _______________a high-speed railway network covering almost all its cities with a population of of more than 500，000 by 2015．

A．is setting up	B．will set up
C．has set up	D．will have set up

解析试题分析：句意：中国在2015年为止将已经建成了覆盖所有城市超过50万人口的高铁网络。这句话的时间是by 2015年，介词by一般和完成式连用，2015年是将来的时候，所以用将来完成式，选D。
考点：考查时态

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