题干

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 up
C.has set upD.will have set up
上一题 下一题 0.64难度 单项选择 更新时间:2014-02-18 02:42:13

答案(点此获取答案解析)