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It is difficult for us to learn a lesso...

 It is difficult for us to learn a lesson in life_____we’ve actually had that lesson.

A.until             B.after             C.since             D.when

 

 A 解析:until引导时间状语从句,意为“直到……”,表示主句的动作一直延续到until从句中动作发生前。after 意为“在……之后”。since 意为“自从”,常与现在完成时连用,表示动作从过去的某个时候开始,一直延续到现在的动作。when 意为“在……时候”。
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