Question

【题目】Some people don't know the value of their health they lose it.

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

Answer 1

【答案】C

【解析】句意：有些人直到他们失去了健康才知道他们的价值。after在……之后；when当……时候；until直到；as作为；not…until…“直到……才……”，故选C。