Many people do not realize the importance of health _____ they have fallen ill.

A. until B. while

C. when D. after

 

A

【解析】

試題分析： after 在……之后 ；when當……時候 ；until 直到……才； while表示當什么的時候；句意：一些人直到生病了，才意識到健康的重要。故選A

考點：考查連詞的辨析。

 

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