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．remainedB．remainsC．is remainingD．is remained
B

試題分析：句意：微軟在4月8日結(jié)束支持Windows XP,這對(duì)一些中國(guó)電腦用戶(hù)仍然是一個(gè)主要的操作系統(tǒng),并建議用戶(hù)升級(jí)到Windows 8.1。remain表示”仍然是”是連系動(dòng)詞，不能用被動(dòng)，因?yàn)閃indows XP現(xiàn)在對(duì)一些中國(guó)電腦用戶(hù)仍然是一個(gè)主要的操作系統(tǒng)，所以用一般現(xiàn)在時(shí)，選B。
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