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

【答案】A
【解析】句意:直到他們已經(jīng)生病了,這些人中才有人會意識到健康的重要性。not ……until直到……才;故選A。

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