—People often don't appreciate what they have, do they? —No, they lose it.A. ifB. afterC.

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A. if
B. after
(答案→)C. until
D. when
解析：
试题分析: 句意：——人们经常不会感激他们所拥有的，是吗？——是的，直到失去它们的时候。A如果；B在……之后；C直到……时候；D当……时候。根据上句可知此处是省略，补充完整应该是people often don’t appreciate what they have until they lose it .答案选C。