The time is not far away when mobile phones widespread in China’s vast country –side. A.

问题补充：

The time is not far away when mobile phones widespread in China’s vast country –side.

A. will become

B. become

C. shall become

D. have become

答案：

(答案→)A. will become

B. become

C. shall become

D. have become

解析：该题易误选B，将when引导的从句误看作时间状语从句，谓语动词用一般现在时表示将要发生的动作。但本句中的when 引导的是定语句，故用一般将来时表示将要发生的动作，will become符合题意。