【題目】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:有些人直到他們失去了健康才知道他們的價(jià)值。after……之后;when當(dāng)……時(shí)候;until直到;as作為;not…until…“直到…………”,故選C。

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