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    2．It is the duty of a teacher _____ the interest of students and pass on knowledge to them．（　　）
    A．to be stimulatingB．to have stimulated
    C．to be stimulatedD．to stimulate

    分析 激发学生的兴趣，传授他们知识是教师的天职．

    解答 答案：D
    题干中it是形式主语，正在的主语是后面的动词不定式；stimulate后接宾语interest，是主动关系；句意表达的是客观事实，要不定式的简单式即可．故选D．

    点评 动词不定式是非谓语动词是一种，表示未发生的动作，用法较多．常用来作定语，主语，宾语，补语，状语等．本题中不定式用来作主语．

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