Question

【题目】None of those people will realize the importance of health _______ they have fallen ill.
A.until
B.while
C.when
D.after

Answer 1

【答案】A
【解析】句意：直到他们已经生病了，这些人中才有人会意识到健康的重要性。not ……until直到……才；故选A。