【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：許多人直到他們病了才意識到健康的重要性。A. Since自從；B. Until直到；C. While當……時候；D. After在……之后，根據(jù)句意"直到……才"應(yīng)選擇連詞until，所以答案是B。

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