Some people won’t realize the importance of their health they have lost it.A. afterB. whe

问题补充：

Some people won’t realize the importance of their health they have lost it.

A. after

B. when

C. until

D. as

答案：

A. after

B. when

(答案→)C. until

D. as

解析：四个选项分别表示在……之后、当……时候、直到……时(多和not一起搭配使用)和当……时候(强调两个动作同时发生)。根据题意C选项为最佳答案，直到失去它时，人们才会意识到健康的重要性。