Some people won’t realize the importance...

Some people won’t realize the importance of their friendship ________ they lose it.

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

C 【解析】句意：一些人直到失去友谊才意识到友谊的重要性。考查连词词义辨析。A. after在……之后；B. when当……时；C. until 直到；D. as因为。根据句意表示直到……才,用not…until，until引导时间状语从句。故选C。

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