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

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

【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……之后;when……时候;until直到;as作为;not…until…“直到…………”,故选C。

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