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    18．--Hi，Mike，I can't find my e-dictionary．
    --Sorry，It ______ now．I will return it to you in ten minutes．（　　）
    A．is usingB．is being usedC．usesD．was used

    分析 --马克，你好，我找不到我的电子辞典了．
    --对不起，我正在用．我将会10分钟之后还给你．

    解答 答案：B．
    根据I will return it to you in ten minutes可知我将会10分钟之后还给你，所以前句表示电子辞典现在正在被用．因此use用现在进行时的被动，答案是B．

    点评 考查现在进行时的被动．用法：
    1）"be being done"中的动词be应随主语（sing．/pl．）作相应的变化．
    2）将现在进行时的主动语态变为现在进行时的被动语态的关键是：把be doing变为be being done．
    例1．The students are cleaning the classroom now．
    →The classroom is being cleaned now．

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