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【题目】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:许多人直到他们病了才意识到健康的重要性。A. Since自从;B. Until直到;C. While当……时候;D. After在……之后,根据句意"直到……才"应选择连词until,所以答案是B。

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