题目内容
18．Many people won't realize how important their health is ___________they fall ill．（ ）| A． | when | B． | until | C． | if | D． | as soon as |
分析 很多人直到生病了才意识到健康有多么重要．
解答 答案：B．
联系语境并根据前后句子的对比，可知本句应理解为：很多人直到生病了才意识到健康有多么重要．；结合关键词 won't，可以判断出此句应用固定表达not…until来完成，意为"直到…才…"引导一个时间状语从句．故选B
点评 比较和分析选项中连词的不同含义及其用法是解答该题的关键；还要根据句中信息正确推测该句句意，进而作出解答．
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