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

A. until B. while

C. when D. after

 

A

【解析】

试题分析: after 在……之后 ;when当……时候 ;until 直到……才; while表示当什么的时候;句意:一些人直到生病了,才意识到健康的重要。故选A

考点:考查连词的辨析。

 

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