5．Air must   fresh ail the time．It's good for our health．（　　）
A．keepB．is keptC．be kept

分析 空氣必須一直保持清新，這對(duì)我們的健康有利．

解答 答案C 情態(tài)動(dòng)詞的被動(dòng)語(yǔ)態(tài)結(jié)構(gòu)：情態(tài)動(dòng)詞+be+過(guò)去分詞．空氣的清新是被人類保持的，也就是keep這個(gè)動(dòng)作的承受者，所以要用被動(dòng)語(yǔ)態(tài)．故選C．

點(diǎn)評(píng) 首先要明白情態(tài)動(dòng)詞被動(dòng)語(yǔ)態(tài)的構(gòu)成，然后結(jié)合句意做出正確選擇．

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