Many young people don't work hard and regret it later when the opportunity is gone.They o

问题补充：

Many young people don work hard, and regret it later when the opportunity is gone.They only realize itit is too late.

A. when

B. before

C. in case

D. until

答案：

(答案→)A. when

B. before

C. in case

D. until

解析：考查状语从句。句意：很多年轻人不努力，当机会失去的时候才后悔。他们认识到这一点的时候已经太迟了。when意为”当……的时候”，根据句意可知，选A。

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