【題目】Some people won't realize the importance of their health u________ they lose it.

【答案】until

【解析】

句意為:一些人不會意識到健康的重要性,________他們失去它。根據(jù)句意可知此處指"一些人不會意識到健康的重要性,直到他們失去它"。故填until。

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