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：

題干為“在真正地經(jīng)歷過(guò)那種教訓(xùn)前，在生活中我們是很難得到教訓(xùn)的�！眜ntil=before; after; since; when等不符合題意。  

 

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