With the computer's system _______. it can't be used at the moment.
A．updatingB．being updatedC．updatedD．to update
B

試題分析：考查非謂語。句義：由于電腦系統(tǒng)正在更新，它現(xiàn)在不能使用了。關(guān)鍵詞：with + 名詞/代詞 + 非謂語，根據(jù)電腦系統(tǒng)和更新之間是被動關(guān)系且根據(jù)后句現(xiàn)在不能使用，說明正在進(jìn)行，所以B正確。
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