Question

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

Answer 1

【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。