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 在新單詞下劃線是很多學生都英語文章的時候的一個習慣．

解答 答案是C．本題考查動名詞做主語．根據(jù)句子的結構，謂語動詞is前缺少的是主語，動詞的過去式、過去分詞和動詞原形不能做主語，所以排除A和B．D項是動名詞的被動語態(tài)，本題中不含被動，所以排除D，由此判斷本題用動名詞的一般式做主語表示"習慣性的行為"，答案選擇C．

點評 對于非謂語動詞的選擇，首先要根據(jù)句子的結構判斷句中缺少的是謂語動詞還是非謂語動詞；如果是非謂語動詞，在理解非謂語動詞的基本用法的基礎上再根據(jù)句子的結構做出判斷．

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