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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

試題分析：句意：大多數(shù)電腦使用者認(rèn)為按時(shí)更新他們的軟件是很必要的。這里it是形式賓語(yǔ)，不定式是真正的賓語(yǔ)，“他們的軟件”和“更新”之間是被動(dòng)關(guān)系，故用被動(dòng)語(yǔ)態(tài)；且表示經(jīng)�；蚍磸�(fù)發(fā)生的動(dòng)作，故用不定式的一般式，選B。
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