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    【题目】Many people do not realize the importance of health___they have fallen ill.

    A. until B．while C．when

    【答案】A

    【解析】

    试题分析：句意：许多人直到生病了才意识到健康的重要性。until直到；while当……的时候；when当……的时候。not……until直到……才，是一个固定句型。所以选A。

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