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    精英家教网 > 高中英语 > 题目详情
    20．-Who______ it be that is knocking at the door？
    -It ______ be Father，but I'm not sure．（　　）
    A．can； mustB．can； mayC．must； canD．may； must

    分析 --可能在谁在敲门呢？
    --也许是父亲，但是我不确定．

    解答 答案是B．本题考查情态动词辨析．在疑问句中表示可能性的推测往往用can，may和must表示推测不出现在疑问句中，所有答案在A 和B中选择；must表示推测时是非常肯定的有依据的判断，may表示不确定的推测；根据下文的not　sure判断不确定是父亲，所以第二空选择may，故答案选择B．

    点评 要在正确理解情态动词的基本含义的基础上，整体理解语境中的情感态度，做出合理的判断．

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