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 激發(fā)學生的興趣，傳授他們知識是教師的天職．

解答 答案：D
題干中it是形式主語，正在的主語是后面的動詞不定式；stimulate后接賓語interest，是主動關(guān)系；句意表達的是客觀事實，要不定式的簡單式即可．故選D．

點評 動詞不定式是非謂語動詞是一種，表示未發(fā)生的動作，用法較多．常用來作定語，主語，賓語，補語，狀語等．本題中不定式用來作主語．

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