14．Influenza H1N1is an illness that can result in death unless left       in time．（　　）
A．treatB．to treatC．treatingD．treated

分析 流感病毒H1N1是一種能導(dǎo)致死亡的疾病，除非及時(shí)治療．

解答 答案是D．本題考查過去分詞做補(bǔ)語．分析句子結(jié)構(gòu)發(fā)現(xiàn)句中存在"連詞+分詞"的結(jié)構(gòu)，即"unless left____ in time"，分詞的邏輯主語就是句子的主語，即Influenza H1N1，與treat之間存在被動(dòng)關(guān)系，所以選擇過去分詞表示被動(dòng)，答案選擇D，其它選項(xiàng)沒有被動(dòng)的含義．

點(diǎn)評(píng) 首先判斷選項(xiàng)中的動(dòng)詞在句中是以謂語還是非謂語形式出現(xiàn)，然后根據(jù)選項(xiàng)在句中的功能結(jié)合非謂語的基本用法做出合理的判斷．

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