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：在還來得及之前，他意識到了自己的錯誤并采取行動減少損失。Until表示“直到------才------”，when表示“當-----時候”，as表示“當-----時候”，before表示“在------之前”。故選C。
考點：考查連詞的用法。

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