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    精英家教网 > 初中英语 > 题目详情
    Computers are very useful in our lives, but they must        properly.
    A. use                 B. be using                C. be used
    C

    试题分析：句意：电脑在我们的生活中非常有用，但是必须恰当地使用它们。结合语境可知下文主语是动作对象，故用被动语态，选C。
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