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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

解析试题分析: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。
考点:考查不定式的用法

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