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9．     the course very difficult，she decided to move to a lower level．（　　）
A．FindB．FindingC．To findD．Found

分析 句意為：她發(fā)現(xiàn)這門課程非常難，決定轉(zhuǎn)學(xué)一門較低水平的（課程）．

解答 答案：B  本題使用排除法． 根據(jù)句子結(jié)構(gòu)可知，the course very difficult在句中作原因狀語（非謂語），因此排除A選項；find的邏輯主語是she，并且存在主動關(guān)系，因此排除D選項；C選項表示目的，根據(jù)句意可以排除；she與find之間是邏輯上的主動關(guān)系，故用現(xiàn)在分詞短語作狀語．所以本題選擇B．

點評 非謂語動詞的判定方法：考慮句中謂語動詞以及其它詞語同非謂語動詞的關(guān)系和對非謂語動詞形式的限制，以便選用正確的非謂語動詞形式．

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