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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

. 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

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

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

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