问题
选择题
Zhengzhou will be more and more convenient when Zhengzhou Subway_____ in two years.
A．is completed
B．will be completed
C．will complete
D．has completed
答案
答案：A
考查时态。主句Zhengzhou will be more and more convenient是一般将来时态，所以when引导的时间状语从句要用一般现在时代替一般将来时。且主语Zhengzhou Subway和complete之间是动宾关系，要用被动语态。所以选A，一般现在时态的被动语态。