Few people paid full attention to their health conditions ________ they were seriously ill.
A．when B．if C．until D．a(chǎn)fter
C

試題分析：考查連詞辨析。A當…時；B如果；C直到…才…；D在…后；本句中的not…until…直到…才…；如果前面的句子使用的短暫性動詞，就使用否定句；如果前面的動詞是延續(xù)性動詞就使用until來引導；句意：直到他們生了重病以后他們才會注意到他們的健康狀況。故C正確。
點評：此題主要考查連詞的辨析，選擇連詞主要是看前后句的關(guān)系，因果關(guān)系用表因果的連詞，轉(zhuǎn)折關(guān)系用轉(zhuǎn)折連詞，并列關(guān)系用并列連詞，要求考生具有一定的句子分析能力和詞義辨析能力。
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