题目

 Few people paid attention to their health conditions    they were seriously ill. A. when          B. if      C. until           D. after   答案:C。考查时间状语从句。句意: ……直到他们生了重病以后他们才会注意他们的健康状况。when当……时; if如果; until直到……; after在……后。本句中的few相当于not, 构成not. . . until. . . 直到……才……。故C正确。  
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