Question

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

A．until

B．when

C．before

D．as

Answer 1

C

解析试题分析：句意：他意识到自己的错误并且采取措施来尽可能地减少损失。before意为“在……之前”，即在太晚之前采取措施；故选C。
考点：考查连词。