题目内容

12．__________ the new words is a habit that many students have when reading an English passage．（　　）
A．UnderlinedB．Underline
C．UnderliningD．Being underlined

分析 在新单词下划线是很多学生都英语文章的时候的一个习惯．

解答 答案是C．本题考查动名词做主语．根据句子的结构，谓语动词is前缺少的是主语，动词的过去式、过去分词和动词原形不能做主语，所以排除A和B．D项是动名词的被动语态，本题中不含被动，所以排除D，由此判断本题用动名词的一般式做主语表示"习惯性的行为"，答案选择C．

点评 对于非谓语动词的选择，首先要根据句子的结构判断句中缺少的是谓语动词还是非谓语动词；如果是非谓语动词，在理解非谓语动词的基本用法的基础上再根据句子的结构做出判断．

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