People don't know the value of health they lose it. [ ] A. if B. before C. until
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People don't know the value of health ______ they lose it.
[ ]
A. if B. before C. until D. after
试题答案
答案：C
People don't know the value of health ______ they lose it.
[ ]
A. if B. before C. until D. after
答案：C