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    精英家教网 > 高中英语 > 题目详情
    Most computer users think it necessary for their software ________ regularly．
    A．to up dateB．to be updated
    C．to have been up datedD．to have updated
    B

    试题分析：句意：大多数电脑使用者认为按时更新他们的软件是很必要的。这里it是形式宾语，不定式是真正的宾语，“他们的软件”和“更新”之间是被动关系，故用被动语态；且表示经常或反复发生的动作，故用不定式的一般式，选B。
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