Many people do not realize the importanc...

Many people do not realize the importance of health ________they have fallen.

A.while B.until C.when D.after

B 【解析】句意：许多人直到倒下才意识到健康的重要性。考查连词。while当……时；until直到……；when当……时；after在……之后；根据句意可知，这里表达的是“直到”，英语是until，在这里构成not … until的结构，表示“直到……才”，故选B。

考点分析：

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