3．Some people won't realize the importance of their health _______ they have lost it．（　　）
A．afterB．whenC．untilD．as

分析 一些人直到失去了健康才意識到健康的重要性．

解答 答案：C after在…之后；when當(dāng)…的時候；until直到；as作為，好像．聯(lián)系語境并根據(jù)前后句子的對比Some people won't realize the importance of their health 和they have lost it可知這里應(yīng)理解為一些人失去健康的時候才會意識到其重要性；結(jié)合關(guān)鍵詞won't，可以判斷出此句應(yīng)用固定表達(dá)not…until來完成，意為直到…才…引導(dǎo)一個時間狀語從句．這里的意思為直到失去健康才意識到健康的重要性．故選C．

點評 聯(lián)系前后語境，在準(zhǔn)確把握前后句關(guān)系的基礎(chǔ)上，先推測出大體句意；再結(jié)合關(guān)鍵詞利用其固定用法選出正確答案．就本題而言，知道not…until的用法是關(guān)鍵．

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