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

A. until B．while C．when

【答案】A

【解析】

試題分析：句意：許多人直到生病了才意識到健康的重要性。until直到；while當……的時候；when當……的時候。not……until直到……才，是一個固定句型。所以選A。

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