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(xué)生都英語文章的時(shí)候的一個(gè)習(xí)慣．

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

點(diǎn)評 對于非謂語動(dòng)詞的選擇，首先要根據(jù)句子的結(jié)構(gòu)判斷句中缺少的是謂語動(dòng)詞還是非謂語動(dòng)詞；如果是非謂語動(dòng)詞，在理解非謂語動(dòng)詞的基本用法的基礎(chǔ)上再根據(jù)句子的結(jié)構(gòu)做出判斷．

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