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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

B

解析試題分析：句意：微軟在4月8日結束支持Windows XP,這對一些中國電腦用戶仍然是一個主要的操作系統(tǒng),并建議用戶升級到Windows 8.1。remain表示”仍然是”是連系動詞，不能用被動，因為Windows XP現(xiàn)在對一些中國電腦用戶仍然是一個主要的操作系統(tǒng)，所以用一般現(xiàn)在時，選B。
考點：考查時態(tài)語態(tài)

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