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

问题补充：

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

A. until

B. when

C. before

D. as

答案：

A. until

B. when

(答案→)C. before

D. as

解析：句意:他意识到了他的错误，在还来得及之前采取措施减少损失。until直到…时候；when 当…时候；before 在…之前；as 当…时候。这里应该是表示在太晚之前，也就是还来得及。故选C。