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

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：A. after在…之后 B. when当…时候 C. until 直到…才 D. as作为；句意：一些人直到失去了健康，才意识到健康的重要。故选C