It is difficult for us to learn a lesson in life we've actually had that lesson. [ ]A. whenB. after C. sinceD. until 题目和参考答案——青夏教育精英家教网——

题目内容

It is difficult for us to learn a lesson in life ______ we've actually had that lesson.

[ ]

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

D

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