【題目】Many people do not realize the importance of health __________ they have fallen ill.
A.since
B.until
C.while
D.after

【答案】B
【解析】句意:許多人直到他們生病了才意識到健康的重要性。since自從;until直到;while當(dāng)……的時候;after在……之后。not…until直到……才,是一個固定句型,所以選B。

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