【題目】Many people didn’t realize the importance of health _______they have fallen ill.

A. until B. while C. when D. after

【答案】A

【解析】

試題分析：句意：一些人直到失去了健康才意識到它的重要性。本題考查的是not…until 句型，“直到……才”。For為了；but 但是；as 作為。故選A。

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