He realized his mistakes and took action to reduce the loss _________ it was too late.

A．until B．when C．before D．a(chǎn)s 

C

解析試題分析：句意：他意識到自己的錯誤并且采取措施來盡可能地減少損失。before意為“在……之前”，即在太晚之前采取措施；故選C。
考點：考查連詞。

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