18．Measures must be taken to prevent pollution ________ happily．（　�。�
A．from we liveB．for us to liveC．us livingD．from our living

分析 必須采取措施阻止污染以便我們能幸福地生活．

解答 答案是B．本題考查動詞不定式充當(dāng)目的狀語；題干中prevent pollution的"目的"是為了幸福生活，故用動詞不定式的復(fù)合結(jié)構(gòu)"for sb．to do sth．"表示目的，答案選擇B．本題容易誤看成短語prevent sb．（from） doing（阻止某人做…），而選擇C和D，C和D語義不符；

點(diǎn)評 首先判斷選項中的動詞在句中是以謂語還是非謂語形式出現(xiàn)，然后根據(jù)選項在句中的功能結(jié)合非謂語的基本用法做出合理的判斷．要關(guān)注常見非謂語動詞的搭配．

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