Question

Microsoft ended support for Windows XP after April 8, which

Microsoft ended support for Windows XP after April 8, which _______a major operating system for some Chinese computer users, and advised users to upgrade to Windows 8.1.
A. remained B. remains C. is remaining D. is remained
为什么选B?详细？

Answer 1

首先不存在被动关系，所以D肯定是排除的；根据后句建议这些用户升级，可以看出前句应该是尚在使用的，所以不是A 。使用这些操作系统是一个持续性的动作，所以一般时态，选B。